Answer:" I have been trying to conceive a baby for a few months."
Explanation:
If she is pregnant, the virus can be passed to the foetus which can cause deafness and some other negative effects to the foetus.
An ancient plant called horsetail contains 216 chromosomes. How many homologous pairs of chromosomes does it contain? How many chromosomes are present in its cells during metaphase?
Answer:
The answers respectively are 108 and 216.
Explanation:
According to the information given in the question, the plant called horsetail has cells that contain 216 chromosomes. They must contain 108 homologous pairs of chromosomes and provided that they are not reproductive cells, during metaphase the replication of the DNA is yet to start so they contain 216 chromosomes in the cells.
I hope this answer helps.
Identical, or monozygotic, twins develop from a single egg fertilized by a single sperm. Monozygotic twins are genetically identical because they originate from a single zygote that split into two. Caroline Lost and her colleagues examined nine measures of social, behavioral, and cognitive ability in 1000 pairs of both male and female identical twins. Their study found that pairs of male twins tended to be more alike in their prosocial behavior, peer problems, and verbal ability scores than pairs of female twins. Which of the following choices explains this observation? s on the X and Y chromosomes in the brains of males results Interacting g in identical twins with more similar behaviors Identical male twins express the same X-linked alleles in their neural cells because males undergo random X-inactivation Male twins have similar expression levels of X-linked genes, because the Y chromosome silences expression of X chromosome genes Q Females are mosaic for the expression of heterozygous X-inked loci because females undergo random X-inactivation
Answer:
The correct answer is "Females are mosaic for the expression of heterozygous X-inked loci because females undergo random X-inactivation".
Explanation:
This study reports that pairs of male twins tended to be more alike in their prosocial behavior, peer problems, and verbal ability scores than pairs of female twins. This is explained by the process of random X-inactivation in pairs of female twins. Random X-inactivation is the transcriptional silencing of one X chromosome in female cells during its development. This results in pairs of female twins being mosaic for the expression of heterozygous X-inked, making female twins actually not identical in its phenotype.
Final answer:
The observation that male identical twins are more alike in certain behaviors and abilities is potentially due to males uniformly expressing X-linked genes, whereas females show variations in expression due to X-inactivation, leading to a mosaic expression of X-linked genes.
Explanation:
The study mentioned in the question observed that pairs of male identical twins exhibited more similar prosocial behavior, peer problems, and verbal ability scores compared to pairs of female identical twins. A possible explanation for this observation is related to the phenomenon of X-inactivation. In females, one of the two X chromosomes present in each cell is randomly inactivated, which leads to mosaic expression of X-linked genes. Since each cell randomly inactivates one of the X chromosomes, the expression of X-linked genes can vary across different cells, potentially leading to more variability in certain traits among female monozygotic twins.
In males, however, there is only one X chromosome to express X-linked genes. This results in males having more consistent expression levels of these genes across cells. Since male monozygotic twins both have the same Y chromosome and the same X chromosome, the expression of these genes will be very similar between the two, potentially leading to more similar behaviors and abilities.
Most of the exchange surfaces of multicellular animals are lined with _____.
Answer:
D) epithelial tissue
Explanation:
The exchange surfaces of the organisms are the site for an exchange of substances or gases. These surfaces mostly lie within the body and protect the exchange tissues. The exchange surfaces of multicellular organisms are lined with epithelial tissues. These tissues have tightly packed cells with little or no intercellular spaces. The epithelial tissues serve to protect the exchange surfaces. Sometimes, these epithelial linings are modified to perform an additional function. The exchange surfaces are finely branched or folded to have a very large area. The digestive, respiratory, and excretory systems all have such exchange surfaces.
Which of the following is true of female genital mutilation? like male cisrcumscision it does not retrict the ability to experience?
Answer:
Child birth complication, low self esteem, urinary problems, reduced satisfaction etc.
Explanation:
Female genital mutilation is a procedure carried out on female reproductive organ, cutting out partially or totally, the external part of the organ. It has no medical benefit and it is practiced in most African countries.
There are different types of female organ mutilation, namely; cutting, piercing, scraping, cauterization etc.
There are so many disadvantages of mutilation, they are;
urinary problem.
child birth complications.
Intercourse problems ( reduced satisfaction).
psychological problems.
Female genital problems.
menstrual problems etc.
A certain cell type has existed in the blood and tissue of its vertebrate host's immune system for over twenty years. One day, it recognizes a newly arrived antigen and binds to it, subsequently triggering a secondary immune response in the body. Which of the following cell types most accurately describes this cell?
Answer:
The options are
A) thyroid cells
B) macrophage
C) memory cell
D) plasma cell
C) memory cell is the ANSWER
Explanation:
B lymphocytes is one of the important cells of the immune system. It's the building block for the memory cells which acts as a means of recognizing pathogens that have previously infected the body system in order to boost the production of antibodies against such pathogen for faster immune response in future infections
A species of malaria-carrying mosquito lives in a forest in which two species of monkey, A and B, coexist. Species A is resistant to malaria, but species B is not. The malaria-carrying mosquito is the chief food for a type of bird in the forest. If all these birds were suddenly eliminated by hunters, which of the following would be an immediate observable consequence?
Answer:
(B) increased mortality in monkey species B
Explanation:
The following deduction can be made from the question:
Species B is susceptible to malariaThe more the population of malaria-carrying mosquito, the more the incidence of malaria in the population of species BA species of bird has been limiting the population of malaria-carrying mosquito by feeding on them. Consequently, this bird species has been indirectly reducing the incidence of malaria in species BHence, if all the birds were suddenly eliminated by hunters,
Malaria-carrying mosquito population will thrive in the forest,Incidence of malaria will increase in species BThis will consequently lead to increased mortality in monkey species BThe correct option is B.
Vision can be affected by drugs and alcohol making, especially difficult to distinguish
A) LightB) ColorsC) DistanceD) Shapes
Answer: B) Colors
Explanation:
The alcohol and drugs can blur one's vision. This is going to affect one's driving ability or skills. These substances can slow down the ability to focus, causes double vision, and the person is not able to distinguish color. The person will not be able to observe and understand the traffic signals, signs and roadways markings. Hence, alcohol and drug consumer in heavy dose are susceptible to accident.
The most high-quality images of the soft tissues of the brain are provided by _________ scans.
Answer:
The answer is MRI.
Explanation:
The method used to get the best quality images of the brain's soft tissue is MRI (Magnetic Resonance Imaging) scans. One of the most common benefits of using MRI is because it does not use x-rays therefore does not emit radiation that is harmful to the subject, which is one of the reasons that it provides high-quality images.
I hope this answer helps.
A population of animals feeds entirely on plants. Some of these animals are good at digesting Plant A, while others are good at digesting Plant B, and others are good at digesting Plant C. What might be an advantage of a single population of animals having a large amount of variability surrounding certain traits?
There’s less scarcity of food for the population is an advantage of a single population of animals having a large amount of variability surrounding certain traits
Explanation:
The population of animal is eating three different types of plants. One of them is good in digesting plant A, one of them is good in digesting plant B and other group is good in digesting plant C.
Thus, the population although has a huge number, but each of the individual is divided into one of the 3 groups which is different in feeding habits. Thus there’s no scarcity of food in the population. Thus the population can live well and reproduce without any nutritional strain.
Answer:
It increases the chance that some members of the population will survive under changing environmental conditions.
Explanation:
Variation of traits between organisms within and among species increases the chance that some members of the population will survive under changing environmental conditions.
If, for example, a disease reduces the amount of Plant A and Plant B in the environment, some members of the animal population will still survive. Since the population can survive on a variety of plants, those that can eat Plant C will be less affected by the disease and will still be successful.
Which of the following statements about olfactory receptors is false?
Select one:
a. They are bulb-like structures at the tip of the frontal lobe where the olfactory nerves begin.
b. They are cells.
c. They are located in a mucous membrane at the top of the nose.
d. They have small, hair-like extensions.
Answer:
They are bulb-like structures at the tip of the frontal lobe where the olfactory nerves begin. (Ans A)
Explanation:
Olfactory receptors which are also known as smell receptor, and present in the cell membrane of olfactory receptor neurons. They are the proteins which are capable of binding with odour molecules which play an important role in the sense of smell.
Each receptor of olfactory cell contains a single external process which extends to the surface which is found in the epithelium, and gives rise long, slender extensions know as cilia. Mucus of the nasal cavity covered the cilia, and facilitating the detection of odour molecules.
Answer:
a
Explanation:
HELP!! Please answer immediately! Answer is for 30 points!
It is possible that a recessive trait in a survey such as this one may have a greater total number than its dominant counterpart. Explain how that might happen in an investigation like this.
Answer:
In such an investigation like this, it might happen that the recessive trait is more than dominant trait making the recessive trait to be the dominant one due to its high rate of occurrences and the dominant one will be the recessive one die to low probability of occurring.
This situation can also happen where there is higher occurrences of recessive alleles than dominant ones as in autosomal dominance and autosomal recessiveness and / or x-linked recessiveness and x-linked dominance.
Describe the relationship and movement between Temperature and Density in a convection cell. Make sure you identify the direction of travel.
Answer:
There is an inverse correlation.
Explanation:
A convection cell can be described as an area of which it's boundries can be stated where two substances either fluid or gas can move due to the temperature changes.
Temperature and density in a convection cell have a relationship which is inversely correlated meaning that if the temperature increases, the density decreases and the matter which has a higher temperature and also lower density moves towards the part with the greater density. The direction of travel of the warmer substance is upwards and vice versa.
The mantle of the earth or the atmospheric movements between the land and the sea can be given as examples to convection cells.
I hope this answer helps.
A technology for collecting data to improve farming practices and increase efficiency is called __________.
Answer:
Precision agriculture
Explanation:
Precision agriculture is the act of using new technologies to increase crop yield and profit, while reducing the amount of the usual input like water, fertilizer, herbicides, insecticide etc. That is to say, farmers cultivates crops and yield more crops for less.
Enhanced genetic seeds,Gps on tractors automatically timed irrigation and using laser to clear fields are all examples of precision agriculture. This gives farmers the boom they need to produce more crops, make profit and promote food availability.
In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are _____, and those encoding the enzymes of a catabolic pathway (such as the lac operon) are ___.
a.repressible; inducible
b.inducible; repressible
c.permanently on ; permanently off
d.permanently off; permanently on
e.easily mutated; resistant to mutations
Operons associated with biosynthetic pathways, like the trp operon, are repressible, while those related to catabolic pathways, like the lac operon, are inducible. The correct answer is a. repressible; inducible.
In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are repressible, and those encoding the enzymes of a catabolic pathway (such as the lac operon) are inducible. Therefore, the correct answer is a. repressible; inducible.
Repressible operons, like the trp operon, typically contain genes encoding enzymes for biosynthetic pathways and are turned off in response to the presence of the end product of the pathway, like tryptophan. Meanwhile, inducible operons, such as the lac operon, often contain genes that are necessary for the metabolism of a specific substrate such as lactose and are turned on only when that substrate is present in the environment.
Organize the steps of the dihydroxyacetone phosphate/glycerol-3-phosphate shuttle.
a. an electron pair is transferred from FADH2 to coenzyme Q and down the electron chain.
b. DHAP is reduced by NADH in the glycerol to glycerol-3-phosphate.
c. DHAP returns back to the cytosol.
d. flavin-dependent glycerol-3-phosphate dehydrogenase converts glycerol-3-phosphate back to DHAP and reduces FAD to FADH2
Answer:
The correct answer is - b, d, a, and c is correct order.
Explanation:
The correct steps of the dihydroxyacetone phosphate/glycerol-3-phosphate shuttle is as follows -
DHAP or dihydroxyacetone phosphate is reduced by NADH in the glycerol-3-phosphate than flavin-dependent glycerol-3-phosphate dehydrogenase transform glycerol-3-phosphate back to DHAP and reduced to FAD to FADH2.
Which is follows by the an electron pair is transport to the coenzyme Q from electron after that the DHAP returns to the back to the cytosol.
The ________ muscle originates on the inner surface of the ilium and the lower borders of the transverse processes (L1-L5), sides of the bodies of the last thoracic vertebra (T12), lumbar vertebrae (L1-L5), intervertebral fibrocartilages, and base of the sacrum.
Answer:
The iliopsoas muscle originates on the inner surface of the ilium and the lower borders of the transverse processes (L1-L5), sides of the bodies of the last thoracic vertebra (T12), lumbar vertebrae (L1-L5), intervertebral fibrocartilages, and base of the sacrum.
Explanation:
The iliopsoas is a muscle that acts in very important functions and is often the cause of low back pain, being a muscle that is not very accessible. It originates on the inner surface of the ilium, base of the sacrum and sides of the bodies of the last dorsal vertebra (known thoracic vertebra as well) (T12) and of all the lumbar vertebrae.
Anatomically the iliopsoas is formed by two muscles: the iliac and the psoas, which in turn we could divide into psoas major and psoas minor. The psoas major is inserted proximally in the body of the 12th dorsal vertebra, in all the lumbar vertebrae and through thinner fascicles, in the lumbar transverse processes. On the other hand, we have the psoas minor that is absent in 41-50% of people. Its path includes from the anterolateral face of the 12th dorsal vertebra and the first two lumbar, until reaching the pectineal line.
Finally, the iliac muscle, which is the second muscular component, originates in the upper two thirds of the internal surface of the iliac fossa, until it reaches the lesser trochanter. It's here that the majority of the fibers join the psoas major forming the tendon of the iliopsoas.
A group of scientists determines that a mitochondrial DNA sequence shared by two species has a constant mutation rate. The sequences of mitochondrial DNA for the two species are shown below.Species A: GACTGGGCATTASpecies B: GACCGGACATGAUsing the principles of molecular clocks and a known mutation rate for this sequence, the scientists determine that these species diverged from a common ancestor 30 million years ago. Based on this information, how much longer do you predict it would take these species to differ by a total of seven base pairs?A. 60 million yearsB. 20 million yearsC. 140 million yearsD. 40 million years
Answer:
D. 40 million years
Explanation:
from the sequence, there is a difference in three base pairs and this took 30 million years. it can thus be concluded that it took 10 million years for a difference in a base.
thus, to make it up to 7 base pairs will require another mutation of 4 base pairs. this will take 40 million years.
Answer:
D) 40 Million years
Explanation:
I took the test
1.)What caused the change in water quality in Flint, Michigan?
The city was taken off the Detroit water system to save money.
City officials decided to stop fully treating the water to save money.
The Flint River became contaminated which caused lead to get into the water.
City officials ignored the Clean Water Act and allowed wastewater to be dumped into the river.
2.)What is graywater?
household wastewater except for the wastewater from toilets
household wastewater that does not contain surfactants
all wastewater generated from household usage
wastewater generated from indoor household usage
3.)Which data help hydrologists predict floods? Select the two correct answers.
impermeable land area
nitrate levels
water temperature
dissolved oxygen
snowpack
4.)Which of the following water filtration methods requires the use of a membrane or filter?
reverse osmosis
ultraviolet radiation
distillation
chlorination
5.)Which of the following courses should a student take in order to become a hydrologist? Choose the three correct answers.
statistics
geography
coding
physical science
philosophy
chemistry
Answer:
1. The answer is (A) The city was taken off the Detroit water system to save money.
2. The answer is (A) household wastewater except for the wastewater from toilets
3. Impermeable land area and snowpack
4. Reverse osmosis
5. geography , chemistry and statistics
Explanation:
1. The answer is (A) The city was taken off the Detroit water system to save money.
Flint water is located in the flint city, Michigan. The Flint water crisis is a communal health issue that occurred five years ago. The flint water changed its source from the treated Detroit Water and Sewerage Department water to the Flint River which resulted in the killing of 12 people and infected 87 people with water disease. The cause of its change was a result of the money taken off the Detroit water system to save money.
2. What is graywater?
The answer is (A) household wastewater except for the wastewater from toilets
3. Which data help hydrologists predict floods?
Impermeable land area
Snowpack
Impermeable land area, and Snowpack
The factors listed above are very important in helping a hydrologist to predict floods. There also other factors such as topography, drainage and many more to make the forecast rightly.
4 the answer is Reverse osmosis
A filtration using a semi-permeable membrane that has small pores that are adequate to move through the molecule of pure water and avoid solvents and germs from entering is called Reverse Osmosis
5. The study of Chemistry has to do with the chemical response which is also required to know the chemical response in Water by a hydrologist. The study of geography deals with the study of the earth which water is inclusive, also statistics is required to understand the importance of parameters when compared with one another
Water is the abiotic factor that got deteriorated in Flint, Michigan because the city was taken off the Detroit water system. Thus, the correct options are 1. A, 2. A, 3. A and E, 4. A, and 5. A, B, and F.
Who are hydrologists?Hydrologists are the people that study and analyze the water and its quality. The water quality in Flint, Michigan changed because the city was removed from the Detroit water system. Hence, option A is correct.
Graywater is household water that gets released from the houses but does not contain the water released from the toilets. Hence, option A is correct. The data from the impermeable land area and snowpacks helps the hydrologists to predict the flood conditions. Hence, options A and E are correct.
The process of reverse osmosis uses the filter and the membrane as the water filtration method. Hence, option A is correct. To become hydrologists the students should take up statistics, geography, and chemistry as the subject. Hence, options A, B, and F are correct.
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Drosophila melanogaster, the fruit fly, has a 2n chromosome number of 8. Assuming that a somatic G2 nucleus contains about 8.0 picograms of DNA, how many picograms of nuclear DNA would you expect in:
a) Mitotic metaphase
b) a primary oocyte (metaphase)
c) a secondary oocyte (metaphae)
d) a first polar body (metaphase)
Answer:
a) Mitotic metaphase
8 picograms
b) a primary oocyte (metaphase)
8 pecograms
c) a secondary oocyte (metaphae)
4 pecograms
d) a first polar body (metaphase)
4 pecograms
Explanation:
a) In mitotic phase the chromosome numbers remains same as 8 because in this phase duplicated chromosomes align in center and separate to other poles. Therefore the amount of DNA will be 8 pecograms.
b) after the mitotic meta phase the cells divide into daughter cell with equal proportion of DNA which means each cell have 8 chromosomes. therefore they both contain 8 pecograms of DNA. The new daughter cells called as primary oocytes.
c) These primary oocytes (8 chromosomes) divides into two secondary oocyte each contain 4 chromosomes which means each cell have 4 pecograms of DNA.
d) Duplication of chromosomes occur in secondary oocyte and cell divides into polar body (4 chromosomes) and ovum (4 chromosomes). Therefore first polar body have 4 pecograms of DNA in it.
See the attachment for clarification.
During mitotic metaphase and primary oocyte metaphase in Drosophila, there are 8.0 picograms of DNA. In a secondary oocyte during metaphase and the first polar body, there are 4.0 picograms of DNA, as these cells are haploid postcompletion of meiosis I.
Explanation:In the context of Drosophila melanogaster, which has a diploid chromosome number of 8 (2n=8), and a somatic G2 nucleus containing about 8.0 picograms of DNA, we can determine the amount of DNA present at different stages of cell division. During the G2 phase, a cell has duplicated its DNA in preparation for mitosis, therefore, a G2 nucleus contains twice the amount of DNA compared to a G1 nucleus.
(a) Mitotic metaphase: In mitotic metaphase, the cell contains 2 copies of each chromosome, just as it does during G2 phase, so you would expect to see 8.0 picograms of DNA, because the chromosomes are aligned and condensed but not yet separated.(b) Primary oocyte (metaphase): A primary oocyte in metaphase I of meiosis also contains 8.0 picograms as it is still diploid until the completion of meiosis I.(c) Secondary oocyte (metaphase): After the completion of meiosis I, a secondary oocyte is in meiosis II, and is already haploid, but since the chromosomes have not yet divided, it would contain 4.0 picograms of DNA, half of the amount in the primary oocyte before meiotic division.(d) First polar body (metaphase): The first polar body, being a byproduct of meiosis I, would similarly contain 4.0 picograms of DNA.
Which pair do you predict would have the largest difference in mass-specific basal metabolic rate?
Answer:
The pair's options needed to complete the question are
A. dog and cat
B. lion and dog
C. lion and cat
D. cat and mouse
E. they are all likely to be the same
D. CAT AND MOUSE IS THE ANSWER
Explanation:
Mass-specific basal metabolic rate (mass-specific BMR), is the resting energy expenditure per unit body mass per day.
mass-specific BMR mammals decreases as weight increases i.e
Metabolic rates of animals are allometric functions of body size
D. Cat and mouse is the answer
A swine producer wants to know if the average weight of his pigs is different from the breed average of 230 lb. He selects a random sample of 16 weights from pigs in his herd and calculates a sample mean of 220 lb and a sample standard deviation of 25 lb. Assume that he wants to detect departure from 230 lb in either direction and that he uses a significance level of 0.10. Calculate the value of the test statistic needed to test the null hypothesis.
Answer: t= -1.60
Explanation:
Let [tex]\mu[/tex] be the population mean weight of pigs.
As per given , we have
[tex]H_0:\mu=230[/tex]
[tex]H_0:\mu\neq230[/tex]
Sample size : n= 16
Sample mean =[tex]\overline{x}=220\ lb[/tex]
Sample standard deviation : [tex]s=25\ lb[/tex]
Since the population standard deviation is not known so the test is a t-test.
Test statistic for population mean : [tex]t=\dfrac{\overline{x}-\mu}{\dfrac{s}{\sqrt{n}}}[/tex]
[tex]t=\dfrac{220-230}{\dfrac{25}{\sqrt{16}}}[/tex] (Substitute all the values.)
[tex]t=\dfrac{-10}{\dfrac{25}{4}}[/tex]
[tex]t=\dfrac{-40}{25}=-1.60[/tex]
Hence, the value of the test statistic needed to test the null hypothesis : t= -1.60
Ocean sediments consist of particles that have slowly settled out of the water by which of the following the processes:
Answer:
E) Suspension settling
Explanation:
Ocean sediments consist of particles that have slowly settled out of the water by which of the following the processes?
A) Paleooceanography
B) Grain lithification
C) Porosity reduction
D) Sediment compaction
E) Suspension settling
Suspension settling is the process by which the particulates present in the liquid settle down at the bottom and form a sediment. The particles tend to settle down at the bottom owing to the force of gravity and due to the centrifugal motion.Thus, the particles that are present in the ocean also settle down in the same manner at the bottom of the ocean to form ocean sediments and thus process is also known as suspension settling.Ocean sediments accumulate through a process known as sedimentation. The sediments contain a mix of organic matter, minerals, and small rock particles that have settled out of the water column over time
Explanation:Ocean sediments accumulate through a process known as sedimentation. This involves particles gradually settling out of the water column over time. The sediments typically consist of a mix of organic matter, minerals, and small rock particles. These particles can originate from various sources such as the weathering and erosion of land rocks, marine organisms' remains (organic matter), and atmospheric dusts. The sinking speed of these particles can depend on their size, shape and density. Larger or denser particles generally sink faster than smaller or lighter ones. This gradual depositing process forms layers of sediments over time on the ocean floor.
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The Shine-Dalgarno sequence in bacteria ________. a) is a purine-rich consensus sequence found in the 5ʹ UTR of the mRNA b) is a pyrimidine-rich consensus sequence found in the 3ʹ UTR of the mRNA c) is a purine-rich consensus sequence found
Answer:
The correct answer is a) is a purine-rich consensus sequence found in the 5ʹ UTR of the mRNA.
Explanation:
The mRNA of bacteria contains Shine- Dalgarno sequence and initiation codon which together make up the ribosomal binding site. The Shine-Dalgarno sequence(5'- AGGAGGU-3') is a short polypurine sequence that is found at 5' end of UTR of the mRNA.
Shine-Dalgarno sequence is found 3-10 nucleotides upstream to start codon(AUG). This sequence is complementary to a region of the 16S rRNA component of small ribosomal units found in bacteria.
So Shine-Dalgarno sequence play an important role in the attachment of small ribosomal subunit of bacteria and recognition of start codon. So the right answer is a.
Final answer:
The Shine-Dalgarno sequence is a purine-rich sequence found in the 5' UTR of bacterial mRNA that is essential for initiating protein synthesis by aligning the ribosome with the start codon. Hence, the correct answer is a. is a purine-rich consensus sequence found in the 5ʹ UTR of the mRNA.
Explanation:
The Shine-Dalgarno sequence in bacteria is a purine-rich consensus sequence found in the 5' UTR (untranslated region) of the mRNA. The sequence is crucial for the recognition and binding by the small ribosomal subunit, which is essential for the initiation of protein synthesis. The Shine-Dalgarno sequence aligns the ribosome with the start codon AUG by base pairing with a complementary pyrimidine-rich sequence at the 3' end of the 16S rRNA, which is part of the 30S ribosomal subunit. This interaction is vital for precise positioning of the ribosome so that translation can begin at the correct start codon.
Which adjustment knob is used for bringing the specimen into focus
Answer:
The coarse adjustment knob is for focusing of the slide.
Explanation:
Coarse Adjustment Knob- The coarse adjustment knob built on the arm of the microscope is for moving the stage up and down to bring the specimen into focus.
Note:
Fine Adjustment Knob - is inside the coarse adjustment knob and is used for sharp focusing of the specimen under low power and is used for all focusing when high power lenses is used.
Acetylcysteine may be used as a mucolytic agent. What is an additional indication for the drug?
Answer:
Apart from the role as mucolytic agent( breakdown of mucus in cystic fibrous and chronic obatructive pulmonary diseases (COPD)
IT CAN BE USED TO TREAT OVER DOSE OF PARACETAMOL.
Explanation:
It performs this role by increasing the availability of antioxidant GLUTATHIONE.The latter neutralizes the toxic effect that paracetamol over dose would produce in the blood plasma.
Females who lift weights are not going to develop large, bulky muscles because __________. A. they have more muscle fibers than men B. they have thicker muscle fibers than men C. they have lower testosterone levels than men D. all of the above Please select the best answer from the choices provided. A B C D
Answer: C. they have lower testosterone levels than men
Explanation:
Although testosterone is a male sex hormone but it can be secreted by the ovaries and adrenal glands of females. The testosterone is responsible for increase in muscle mass and increase in strength in both males and females. In females the level of testosterone remains lower than men hence, the muscle mass in females is not bulky.
Answer:
C
Explanation:
The guy below above explained it perfectly
Which of the following people most likely got cancer because of environmental factors?
A) A 36-year-old man with brain cancer.
B) A 67-year-old man with prostate cancer.
C) A 52-year-old woman with bone cancer.
D) A 47-year-old woman with lung cancer.
Answer: option D - (A 47-year-old woman with lung cancer.)
Explanation:
Cancer is a disease in which the cells of a tissue undergo uncontrolled (and often rapid) proliferation. It can be caused by factors ranging from genetic defects to environmental or lifestyle patterns to microbial infections, radiation exposure etc.
Lung cancer largely occurs when an organism is exposed to environmental factors such as pollutants in the air, soil or water. Also, unhealthy habits such as smoking cigarettes, tobacco are highly implicated.
Note, UNLIKE Lung cancer, other kinds of cancer mentioned have stronger genetic basis
You are interested in researching the effects of vitamin C on colds. For your study, you round up a group of people, all roughly the same age and healthy. You give them all vitamin C pills to take every day and have them check in with you once a month to see if they get a cold. Why is this not a good study design
Answer: the research study lacked a control group, It was difficult to know individuals who are not taking Vitamin C and exposed to cold
Explanation:
Normally in a research study there should be a control group of the same age group like the study group in the same environment, who will not Vit, C but a placebo. To determine if Vitamin. C is the actual effective drug for prevention of cold in the study group or other factors.
Therefore, in this study It was difficult to know individuals who were not taking Vitamin C and exposed to cold(control group) Because, it is the comparison of the data from the control group and the study groups that is needed to determine the efficacy of Vitamin C
The study of minerals is called mineralogy. There are different types of minerals are there and these are calcium, phosphorus, magnesium, sodium and etc.
The correct answer is the research study lacked a control group, It was difficult to know individuals who are not taking Vitamin C and exposed to cold
What are minerals?A mineral or mineral species is, broadly speaking, a solid chemical compound with fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form. The geological definition of mineral normally excludes compounds that occur only in living beingsNormally in a research study, there should be a control group of the same age group like the study group in the same environment, who will not have Vitamin, C but a placebo. To determine if Vitamin. C is the actual effective drug for the prevention of cold in the study group or other factors.
Therefore, in this study, It was difficult to know individuals who were not taking Vitamin C and were exposed to cold(control group) Because it is the comparison of the data from the control group and the study groups that are needed to determine the efficacy of Vitamin C.
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An increase in the amount of carbon dioxide in the blood stimulates the respiratory center of the brain. As a result, impulses are sent from the(1) medulla to the diaphragm, increasing the rate of breathing(2) cerebrum to the chest muscles, decreasing the rate of breathing(3) medulla to the trachea, causing it to constrict(4) cerebrum to the alveoli, causing them to activelytransport oxygen
Answer:1) medulla to the diaphragm, increasing the rate of breathing
Explanation:
Basically involuntary respiration is controlled by the Respiration centers in the brain Stem. They are group of respiratory neurons ; the dorsal and ventral respiratory groups located in the medulla oblongata , and the pontine respiratory group located in the Pons varolii.
The primary function of this center is for creation and maintenance of respiration rhythms and adjustment of the sequences to fluctuation in body homeostatic balance .
In order to regulate respiration rate and its depth, it collects its input signals from chemoreceptors ( cells that generate biological signals from chemical substances), mechanoreceptors( receptors which relay external physical stimuli of touch, and pressure to internal stimulus by regulation of gated ion channels), the hypothalamus and the cerebral cortex. The fluctuation in the levels of plasma C02, oxygen, and blood pH, stimulated the input progression.
Therefore an elevated C02 blood levels, marked by low pH send input signals to the respiratory centers in the medulla.The latter sends signals to the respiratory muscles (and the diaphragm,) to initiate mechanism of rapid breathing to exhaled more C02 so that the acidity of the blood is reduced..
The correct choice is the medulla sending signals to the diaphragm to increase the rate of breathing in response to high levels of carbon dioxide. This process involves deepening respiration to bring CO2 levels back to normal.
Explanation:The major factor that stimulates the respiration centers in the medulla oblongata and pons is the concentration of carbon dioxide (CO2) in the blood. An increase in CO2 prompts the medulla to send impulses to the respiratory muscles. When CO2 levels rise, it diffuses across the blood-brain barrier and results in increased hydrogen ion concentration, which in turn lowers the pH of the blood.
This acid-base effect is sensed by central chemoreceptors, which initiate a response to increase the contraction of the diaphragm and intercostal muscles. Consequently, the rate and depth of respiration increase, and more CO2 is expelled, bringing levels in the blood back to normal.
To answer the student's question directly, the correct choice is: (1) medulla to the diaphragm, increasing the rate of breathing. This process helps regulate the levels of CO2 and maintain a stable pH, ensuring proper function of the body's systems.
A researcher uses a radioactively-labeled carbon dioxide molecule to evaluate photosynthetic rate. In her experiments, the researcher finds adequate consumption of water, generation of oxygen and NADPH production, but no change in plant mass. The most likely dysfunctional system in the plant is:_______________________________.
Answer:
Answer is Calvin cycle.
Explanation:
Calvin cycle is very important to plants because it helps in the conversion of organic products for the usefulness of plants. This is because the carbon dioxide and water are converted to glucose, which is useful to plants.
Calvin cycle can be explained as the production of glucose through the use of chemical energy from NADPH and ATP, produced in light reactions, to convert the atmospheric carbon dioxide to RuBP, which is a five-carbon molecule.