Answer:
Mutation.
Explanation:
Mutation may be defined as the sudden heritable change in the DNA sequence of the organisms. Mutation can results in the change in the genotype and phenotype of the organisms.
Two main types of mutation are spontaneous mutation and induced mutation. Induced mutation occurs intentionally with the help of the mutagens. Spontaneous mutation is the natural mutation that occurs for the no known reason.
Thus, the answer is spontaneous mutation.
Which statement best describes an activity that will contribute to the maintenance of homeostasis in an organism?
1. A shark swims toward a high polluted region of the ocean.2. A desert rattlesnake enters an underground burrow on a hot summer day.3. Roots of a willow tree grow away from a moisture-rich region of the soil4. A polar bear sheds most of its fur during the coldest months of the winter.
Answer: .2. A desert rattlesnake enters an underground burrow on a hot summer day.
Explanation:
Homeostasis can be defined as the ability to maintain stability, equilibrium and balance in the inner body with respect to the changes occurring in the external environment. The maintenance of homeostasis is necessary for the organism to survive in adverse conditions. For example, temperature change.
A desert rattlesnake is maintaining the homeostasis with respect to the external environment by maintaining the temperature by entering the burrow. As if it remain exposed to the warm environment the body of the snake will get dehydrated.
The best statement representing an activity that maintains homeostasis is the desert rattlesnake entering an underground burrow on a hot summer day. Homeostasis involves maintaining a stable internal environment, and this behavior enables the rattlesnake to regulate its body temperature effectively.
Explanation:The statement that best describes an activity that will contribute to the maintenance of homeostasis in an organism is: A desert rattlesnake enters an underground burrow on a hot summer day. Homeostasis refers to an organism's ability to maintain a stable internal environment despite changes in external conditions. The example of the rattlesnake seeking a cooler environment when it's hot allows for better temperature regulation, hence maintaining homeostasis.
Sharks moving to a polluted area, willow tree roots growing away from moisture, or a polar bear shedding its fur during winter are actions that could disrupt rather than maintain homeostasis.
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The nursing instructor is teaching the students about anesthesia and informs them that there are two types. What are those two types of anesthesia? (Select both that apply.)A. Local anesthesiaB. Topical anesthesiaC. General anesthesiaD. Regional anesthesiaE. Spinal anesthesia
Answer:
The answer is C and D.
Explanation:
Although there are more than two types of anesthesia, 3 to be exact, which are local, general and regional, the two types of main anesthesia are;
1 - General Anesthesia which renders the subject unconscious for an operation or treatment.
2 - Regional Anesthesia which blocks the registration of pain for a certain body part so that the patient does not experience the pain during the procedure.
I hope this answer helps.
Which of the following animal-derived foods contains a significant amount of carbohydrates?
a. eggs
b. beef
c. milk
d. poultry
Carbohydrates are one of the nutrients of food that are required to produce energy in the body. They are classified as Starches and Sugars(Saccharides).
Lactose is a disaccharide. This means it is made up of two monosaccharides called galactose and glucose. It is also referred to as milk sugar and it is one of the sugars classified as a carbohydrate.
Therefore, Option c is the correct option
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Which of the following spiders can cause a characteristic wound with a bite that is often painless?
A.
Brown recluse spider
B.
Black widow spider
C.
Argiope spider
D.
Sheet web spider
Answer: A. Brown recluse spider
Explanation:
The brown recluse spiders are 0.5 inches long. These are dark violin shaped wound found on the head and midsection. The bite caused by these spiders includes symptoms like reddened skin, blister, pain and itching. The effect of bite remains for 2 to 8 hours. Usually an open sore ulcer develops due to the breakdown of the tissue or necrosis.
A woman who is a carrier for hemophilia marries a hemophiliac man. What will be their children’s possible phenotypes?
Answer:
Hemophilia is a sex-linked recessive disorder in which a person's blood do not clots and he can bleed to death even after minor injuries because blood will keep running due to a small cut.
It is a recessive trait which means that even if one normal gene is present along with Hemophiliac gene, the person will not have the disease and he will be the carrier.
Question: What will be their children’s possible phenotypes?
If a woman who is a carrier for hemophilia marries a hemophiliac man, their genotypes can be denotes as :
Here H, indicate normal gene and small h indicate defected (hemophilia) gene.
Parents: XHXh X XhY
Offspring: XHXh : XHY: XhXh: XhY
Phenotype of offspring:
XHXh: The child will be daughter and normal (25 % chances)
XHY: The child will be son and normal (25 % chances)
XhXh: The child will be girl and Hemophiliac (25 % chances)
XhY: The child will be son and Hemophiliac (25 % chances)
Hope it helps!
How can you determine the most effective antibiotic to treat a pathogenic bacterial infection?
Answer:How you can determine the most effective antibiotic to treat a pathogenic bacterial infection is the use of antibiotic sensitivity test.
Explanation: sensitivity analysis is a test that determines the “sensitivity” of bacteria to an antibiotic. It also determines the ability of the drug to kill the bacteria. The results from the test can help your doctor determine which drugs are likely to be most effective in treating the bacterial infection.
Angiotensin-converting enzyme (ACE) inhibitors and other vasodilators are used in the early treatment of heart failure. They act to
a. cause loss of volume
b. increase arterial pressure and perfusion
c. cause pooling of the blood and decreased venous return to the heart
d. increase the release of aldosterone and improve fluid balance
Answer:
Option c. cause pooling of the blood and decreased venous return to the heart
Explanation:
The ACE inhibitors increases the diameter of the blood vessels (vasodilation) that improves the flow of blood. This reduces the work load on the heart. At the time of heart failure, a substance called angiotensin is released. This angiotensin formation is blocked by the ACE inhibitors. Angiotensin is involved in narrowing the blood vessels.
The ACE cause pooling of the blood and decreased venous return to the heart. The ACE inhibitors causes vasodilation that allows decrease in blood pressure. So, there is no increase in arterial pressure, aldosterone and loss of volume. Thus, option C is correct.
How does the neuron at a neuromuscular junction interact with the muscle to which it is attached
Answer:
through synaptic transmission as action potential , which transmits the action potential across to synapse( neuromuscular juction ) to reach the postsynaptic end plate. the end -plate terminated on the muscles to bring response.
Explanation:
Tau is a microtubule-associated protein that plays a key role in the development of certain brain disorders. To analyze Tau expression, mouse brain extracts are made at different developmental stages, separated on an SDS-PAGE gel, and analyzed by western blot with antibodies recognizing only mouse Tau protein. If the results at the right represent Tau’s normal expression pattern, the two different size protein products could result from:
1. transcription of Tau DNA in different directions.
2. translation of Tau mRNAs of different sizes.
3. expression of two different genes.
4. different chemical modifications of Tau protein.
Answer:
1. transcription of Tau DNA in different directions.
4. different chemical modifications of Tau protein.
Explanation:
Tau gene transcribe in different direction which depends upon the animal age. This happens because at different age and developmental stage, animal produce different RNA binding proteins which leads to formation of alternative splice forms. This reaction is strengthen by the addition of phosphate and sugar molecules which again depending on developmental stage and time.
Final answer:
The two different size Tau protein products could most likely be due to different chemical modifications, such as hyper-phosphorylation, leading to neurofibrillary tangles characteristic of disorders like Alzheimer's and CTE. These disorders are examples of proteopathies, where protein misfolding leads to toxic accumulations in cells.
Explanation:
The two different size protein products observed in a western blot analysis of mouse brain extracts at different developmental stages using antibodies against Tau protein could potentially be a result of different chemical modifications of Tau protein.
In normal neurons, Microtubule-Associated Protein Tau (MAP-T) is phosphorylated to stabilize microtubules. However, in some brain disorders like Alzheimer's Disease, tau becomes hyper-phosphorylated, leading to a change in its conformation. As a result, the microtubules are destabilized, and the misshapen tau proteins form neurofibrillary tangles within the neurons.
While differential mRNA sizes or different genes could also theoretically lead to differences in protein size, the process mentioned above involves post-translational modifications affecting the protein product. Protein function and stability are highly dependent on their three-dimensional foldings, such as seen with tau proteins in the formation of neurofibrillary tangles in degenerative diseases like Alzheimer's and CTE (Chronic Traumatic Encephalopathy).
It is these conformational changes and resulting accumulations that are characteristic of proteopathies, disorders where misfolded proteins become toxic.
In the nervous system, neurotransmitters are the main means of communication between neurons. The main means of communication between organs in the endocrine system is by__________.
Answer:
The answer is hormones.
Explanation:
Two of the main systems that control almost every action in our body are our nervous system and endocrine system which have to have inner communications and communication with our brain.
As stated in the question, nervous system uses neurotransmitters for communication which are chemicals released by neurons to generate electrical signals that make the communication possible.
The main mean of communication that our endocrine system uses is substances that are called "Hormones" which are produced by certain glands and organs in our body and are usually released into our bloodstream to effect the functions of other organs and our body. Hormones can be used for both communication of the endocrine system itself and for the communication of other organs and our brain.
I hope this answer helps.
One species of a small birdlike animal has an extremely variable tail length, which is a highly polymorphic trait. Geneticists have come to realize that there are eight separate genes for tail length per haploid genome, with each gene having two alleles. One allele for each gene (a, b, and so on) increases the length by 1 cm, whereas the other allele (a2, b2, and so on) increases it by 0.5 cm. One bird was analyzed and found to have the following genotype: a1a1b2b2c1c2d1d2e2e2f1f2g1g1h1h2. What is the length of its tail?
A) 6 cm
B) 36 cm
C) 8 cm
D) 12 cm
E) 24 cm
Answer:
D. 12cm
Explanation:
there are 8 A1, C1 and so on alleles there, this will be 8 cm and there are about 8 a2 and so on alleles, this will be 4cm.
8 + 4 = 12cm
Which of the following characterizes the lag phase of the bacterial growth curve?
Answer:
Little increase in cell number
Explanation:
There are four distinct phases in the bacterial growth curves that is lag, log, stationary and death phase. The lag phase of the bacterial growth curve is characterized by very little increase in the cell number.
The growth rate of bacteria in the lag phase is slow because the medium is new to the bacterial culture and it requires time for bacteria have to adapt to the new cultural environment and to synthesize enzymes required for substrate utilization.
After getting adapt in their new environment bacteria starts to grow at an exponential rate. So little increase in cell number characterizes the lag phase.
You may carry an opened container of alcohol in your vehicle only if the container is _____.
Answer:closed
Explanation:
The body wall of cnidarians and ctenophores consist of:_________ a. inner and outer cell layers separated by a jelly-like mesoglea. b. two epidermal layers with scattered mesophyll cells in between. c. three tissue layers. d. loosely organized cells
Answer:
a. inner and outer cell layers separated by a jelly-like mesoglea.
Explanation:
The body wall of cnidarians and ctenophores consist of a inner and outer cell layers separated by a jelly-like mesoglea. The function of this mesoglea offer an hydrostatic skeleton to the Cnidarians.
The mesoglea is composed of several substances including fibrous proteins, like collagen and proteoglycans but in both cnidaria and ctenophora, the mesoglea contains muscle bundles and nerve fibres.
Certain traits will have been lost from the gene pool forever. some may be obvious, like people with red hair or double jointed thumbs. others will be less obvious, like the ability to process cholesterol or being allergic to peanuts.
This loss of diversity in a reduced population is called ________.
A. gene flow
B. bottleneck effect
C. genetic drift
D. founder effect
Final answer:
The reduction in genetic diversity in a population due to a significant loss of individuals is known as the bottleneck effect, which is an example of genetic drift and differs from the founder effect. So the correct option is B.
Explanation:
The loss of diversity in a reduced population you're describing is called the bottleneck effect. This effect occurs when there's a significant reduction in population size due to a random event, such as a natural disaster, which results in a large portion of the gene pool being wiped out. In one instance, the surviving population's genetic structure becomes representative of the entire population, leading to reduced genetic variation.
Both the bottleneck effect and the founder effect are specific examples of genetic drift. However, they are not the same. While the bottleneck effect is often due to a drastic and sudden decrease in population size, the founder effect occurs when a new population is established by a small number of individuals from a larger population, potentially carrying an unrepresentative set of alleles.
Many countries around the world today are trying to use renewable resources in such a way that the resource will be able to meet the needs of their citizens long into the future. What name is given to this practice of using resources carefully so that future generations may also be able to meet their needs? Group of answer choices
Answer:
Sustainable development.
Explanation:
As many countries around the world have realized the need to save and conserve the environment they are relying more on the use of the renewable resources and thus the needs to man can be met of we use each and every resource on earth in a just and sustainable fashion rather than continuous exploitation so the future of the planet is safe.Answer:
Sustainable development.
Explanation:
i took the test
Use the phylogenetic tree to the right to determine which statement below is true.
Organisms A and F are not related.
Organism E is more closely related to organism B than organism F.
Organisms C and D are more closely related than organisms A and B.
Answer:
Organisms C and D are more closely related than
Organisms A and B
Explanation:
Organisms A and B are not related much as the distance between them is more than the organisms C and D so the C and D are closer than A and B. The phylogenetic tree shows the biological evolutionary relationship among various biological species. So the given tree shows the relationship as mentioned above.
It also show the physical and genetic relationship among the various biological species. The phylogeny is generally shown by using a particular phylogenetic tree. For example, the simple one below which describes the different evolutionary relationships between the great apes. The genus Pongo includes orangutans, Pan includes chimpanzees and bonobos, and Homo includes humans, while Gorilla is self-evident.
Organism relationships are based on a phylogenetic tree which shows "organisms C and D are more closely related than organisms A and B" as the true statement.
Explanation:The phylogenetic tree visually represents the evolutionary relationships among different biological species, supporting the described relationships. Organisms A and B are distantly related, indicated by their greater evolutionary distance compared to organisms C and D, which suggests that C and D are more closely related than A and B. This tree also conveys both the physical and genetic connections among these species. Phylogeny is typically depicted using specific phylogenetic trees, such as the simplified one below, illustrating the diverse evolutionary relationships among great apes. In this context, the genus Pongo encompasses orangutans, Pan includes chimpanzees and bonobos, Homo encompasses humans, and Gorilla represents gorillas.
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Without elephants, some of the grasslands in Africa would eventually become thickets or forests because elephants weed out trees and shrubs. Even though elephants make up a small percentage of the animals living on the grassland, the grassland would eventually cease to exist without them. In this community, elephants are __________.
Answer:
Without elephants, some of the grasslands in Africa would eventually become thickets or forests because elephants weed out trees and shrubs. Even though elephants make up a small percentage of the animals living on the grassland, the grassland would eventually cease to exist without them. In this community, elephants are keystone species.
Elephants are often called “keystone species” because of their unique role in providing vital services to an ecosystem in relation to their abundance.
Explanation:
Elephants play a very important role in maintaining the biodiversity of the ecosystems in which they live. During the dry season, elephants use their tusks to dig for water. This not only allows the elephants to survive in dry environments and when droughts strike, but also provides water for other animals that share harsh habitats.
Elephants eat some trees and create gaps in the vegetation. These allow new plants to grow and create pathways for other smaller animals to use. They are also agent of seed dispersal of trees and in fact some species of trees rely entirely upon elephants for seed dispersal.
Elephants feed on tree sprouts and shrubs in savannahs. They help keep the plains open and able to support the plains game that inhabit these ecosystems.
Elephants also leave a dung that is full of seeds from the many plants they eat. When this dung is deposited, the seeds are sown and grow into new grasses, bushes and trees, thereby boosting the proliferation organisms in the savannah ecosystem.
Final answer:
Without elephants, African grasslands would likely transition into thickets or forests, signifying their role as keystone species that manage the vegetation. Elephants engage in ecosystem engineering through weeding out trees and shrubs, dispersing seeds, and facilitating species diversity.
Explanation:
Without elephants, some of the grasslands in Africa would eventually become thickets or forests. This is due to the ecosystem engineering role of elephants, who help maintain the grassland habitat by weeding out trees and shrubs as they feed on them, disperse seeds, and create disturbances that prevent tree regeneration. Elephants are therefore crucial keystone species in these ecosystems, shaping vegetation structure and composition, influencing biodiversity, and affecting the survival of other species.
Elephants are not only important for maintaining grassland ecosystems but they also facilitate species diversity and ecosystem processes. Their dung provides a significant source of food for dung beetles and serves as a germination site for seeds. However, it's important to balance their numbers, as overpopulation can lead to habitat destruction and the decline of other species upon which they depend. This delicate balance emphasizes the complex role elephants play in their habitats and the conservation challenges faced in managing their populations.
A species of small lizard has three color forms, pale gray, brown, and black. In its original range, the colors of the rocky environment were mixed from pale gray to very dark, and the population had an even mix of all three color forms. The blending of colors with their environment helps the lizards hide from predators. A group of these lizards ended up on an island with all gray rocks. Eventually, only gray lizards remained. This is an example of
Answer:
Directional Selection
Explanation:
In population genetics, directional selection also know as positive selection is a mode of natural selection in which an extreme phenotype is favored over other phenotypes, causing the allele frequency to shift over time in the direction of that phenotype
Medicines are often administered in pill form. In many cases, the active ingredient of the pill (the drug) is joined to another substance by ________. This forms a/an ________, which is stable in the dry environment of a pill bottle but dissociates under the wet conditions of the digestive system to release the drug to the body.
a. covalent bonds; salt
b. ionic bonds; salt
c. ionic bonds; acid
d. hydrogen bonds; base
Answer:
Option B, ionic bonds; salt
Explanation:
All medicines either in the form of pills or liquid interact with our body by forming a bond with target specific receptors. For instance if a pain killer is taken then it shall form bond with receptors produced by pain and inflammation
So medicines are basically chemical which interact with biomolecules such as enzymes, nucleic acid, hormones, ions etc. by forming ionic bond, hydrogen bond, van der wall force etc. in the active site of enzyme.
These salt molecule remain stable in normal conditions but as they come in contact with digestive system of the body (with different pH) they release the drugs
Hence, option B is correct
Movement of fluids and solutes out of capillaries into the interstitial fluid occurs by filtration, which is driven by capillary blood pressure and opposed by
Answer:
The correct answer will be- interstitial fluid hydrostatic pressure
Explanation:
The exchange of fluid between the tissues and the capillaries is determined by the hydrostatic pressure which refers to the pressure exerted by any fluid in an enclosed space.
The pressure exerted by the blood on the walls of the capillary vessels is known as the capillary hydrostatic pressure which is responsible for the exchange of the fluid between tissues and the capillaries.
During the exchange of the fluid from the capillaries to the issues the hydrostatic pressure of the interstitial fluid rises which is known as the interstitial fluid hydrostatic pressure. This pressure opposes the fluid exchange so the capillary hydrostatic pressure is usually found higher than the interstitial fluid hydrostatic pressure.
Thus, interstitial fluid hydrostatic pressure is the correct answer.
Filtration, the process of movement of fluids and solutes from capillaries to interstitial fluid, is driven by hydrostatic pressure and opposed by osmotic pressure. Hydrostatic pressure forces out fluids, whereas osmotic pressure counters this by drawing fluids back into the capillaries.
Explanation:The movement of fluids and solutes out of capillaries into the interstitial fluid, known as filtration, is primarily regulated by two forces: hydrostatic pressure and osmotic pressure. Hydrostatic pressure, also known as capillary blood pressure, is exerted by blood against the walls of blood vessels due to the pumping action of the heart. It forces plasma and nutrients out of the capillaries and into surrounding tissues. However, this process is counteracted by osmotic pressure, which is primarily produced by circulating albumin. Osmotic pressure draws fluid back into the capillaries, and is influenced by solute concentration gradients. The balance between these two pressures drives the process of fluid movement between compartments.
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Nitrogen from the atmosphere is combined into organic compounds by legumes, such as _________________.
a. beans, peas, or lentils
b. rice, wheat, or corn
c. apples, pears, or oranges
d. spinach, chard, or lettuce
Answer:
a. beans, peas, or lentils
Explanation:
Living organisms need nitrogen to make proteins. These proteins are used for growth and making enzymes. Most plants do not have a way of getting nitrogen directly from the atmosphere. However leguminous plants are unique in that they have nodules that can fix nitrogen from the air.
The endocrine system incorporates feedback mechanisms that maintain homeostasis. Which of the following demonstrates negative feedback by the endocrine system?A) During labor, the fetus exerts pressure on the uterine wall, inducing the production of oxytocin, which stimulates uterine wall contraction. The contractions cause the fetus to further push on the wall, increasing the production of oxytocin.B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels.C) At high elevation, atmospheric oxygen is scarcer. In response to signals that oxygen is low, the brain decreases an individual’s rate of respiration to compensate for the difference.D) A transcription factor binds to the regulating region of a gene, blocking the binding of another transcription factor required for expression.
Answer:.B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels
Explanation:
Homeostasis is the ability to keep the conditions of it's internal environment constant, regardless of the external environment.it does this either by increasing the effect of a recieves stimuli (positive)or reducing the effect of the stimuli (negative). negative feedback mechanism is used by the body to restore it back to it's normal conditions.majority of homeostatic mechanisms are negative feedback.
For example the regulation of blood glucose levels which is regulated by the hormones,insulin and glycogen to keep it constant.
The failure of this homeostasis process would lead to diabetes
The answer option which demonstrates negative feedback by the endocrine system is: B. After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels.
An endocrine system can be defined as series of ductless glands and organs that are responsible for the production and secretion (release) of hormones that are used in the body of a living organism, for the performance of various functions such as:
MetabolismControlling growthReproductionMoodSleepDigestionGenerally, the hormones are secreted (released) directly into the circulatory system (blood) and then transported to the organs and tissues in the body. Thus, the endocrine system contributes significantly to the state of homeostasis in the body.
During homeostasis, a negative feedback-loop inhibits (decreases or reduces) the response by the body system.
In this scenario, a negative feedback is demonstrated by the endocrine system when beta cells of the pancreas release insulin into the blood, so as to reduce blood glucose levels after a meal.
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Cortisol is a hormone produced in response to stress, including starvation, in humans. Which of the following is most likely an immediate effect of a starvation-induced increase in cortisol secretion?
Answer:
Fat and Protein metabolism, increasing amino acid to the muscles.
Explanation:
Cortisol is a steroid hormone produced in many animals. It is used in medication as hydrocortisone. Produced in large quantity in the adrenal gland and low quantity in other tissues. The secretion of this hormone increases with stress and low blood sugar due to starvation. When the blood sugar is low, it tries to increase the blood sugar through gluconeogenesis and at extreme, fat and protein metabolism and reduced bone formation in animals
a_____that tells you how you will be graded on an assignment or assessment is called a_____
A grading rubric is a tool that outlines the criteria and expectations for an assignment or assessment, providing guidance on how it will be graded. It is used in various subjects and grade levels.
Explanation:The term that describes how you will be graded on an assignment or assessment is called a grading rubric. A grading rubric is a tool that outlines the criteria and expectations for the assignment, and it often includes a scoring scale or specific guidelines for each level of achievement. For example, in a math class, a grading rubric might specify that correct calculations are worth a certain number of points, while showing work and providing explanations are worth additional points.
Grading rubrics are used in various subjects and at different grade levels, including Mathematics, History, English, Biology, Chemistry, Physics, Social Studies, Advanced Placement (AP), SAT, Geography, Health, Arts, Business, Computers and Technology, French, German, Spanish, World Languages, Medicine, Law, and Engineering.
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Why is it difficult to demonstrate the existence and importance of competition?
Answer:
Existence in the competition is very hard to maintain. The competition is a negative interaction between species in the area where more species want the same resource.
Explanation:
Competition makes growth less productive. One organism can’t have the resource if other organisms are using it. There are various types of competition, and some of them are interruption and exploitation. In the interrupting competition, organisms are in contact and they are fighting for resources directly.
However, competition is important. Organisms are trying their best to provide the existence for themselves, and the best way to do it is by competing with others and using all the resources they need. It is like a circle without an end.
Which situation would inhibit a Krebs cycle from functioning in an organism’s cells?
Answer:
If the formation of Acetyl CoA does not occur.
Explanation:
A Krebs cycle which is also known as the citric acid cycle, is a cycle showing parts or series of chemical reactions to generate energy by aerobic organisms.
The acetyl coA is converted to two carbon molecule, that is, oxaloacetate, which enters the Krebs cycle.
Write the letter all of the following statements that are NOT true. a. Coding sequences for gene products can be isolated from cDNA libraries. b. Antibodies are used for Northern blot analysis. c. VNTRs are highly conserved in human populations. d. PCR amplification generates large numbers of linear DNA fragments. e. RNA molecules can be used as hybridization probes in Southern blot analysis.
Antibodies are used for Northern blot analysis and VNTRs are highly conserved in human populations are the following statements that are NOT true.
b. Antibodies are used for Northern blot analysis.
c. VNTRs are highly conserved in human populations.
Explanation:
The antibodies cannot be used for Northern blot analysis. The northern blot analysis detects the RNA molecules precisely among the group of RNA.
The sample of RNA is taken from specific cell type or tissue and is analyzed to measure the RNA expression of particular genes.
A variable number tandem repeat (VNTR) is found on many chromosomes, and it varies in length from each and every person.
An isotope sample initially weighing 500 grams decays to produce a daughter element. What is the amount of parent element remaining after two half-lives?
Answer:
The answer is 125 grams.
Explanation:
Elements and substances decay in time and the amount of time for it to be half of it's initial amount is defined as "half-life of that substance".
In the example, the initial weight is 500 grams and we are asked to determine the amount after two half-lives, which after the first half-life is 500/2 = 250 grams and after the second one, 250/2 = 125 grams remains from the parent element.
I hope this answer helps.
Which statement is true?
a. The racial origin of hair can always be identified.
b. Hair can be individualized through its trace elemental composition. c. Hair is routinely examined to determine sex.
d. Two hairs from the same head may not have the same morphological characteristics.
Answer:
The statement which is true is as follow:
d. Two hairs from the same head may not have the same morphological characteristics.
Explanation:
The statement in option a is not correct as we can't always determine the racial origin of hair.The statement in option b is not correct as it is not possible to do through trace elemental composition. The statement in option c is not correct as hair is not examined to determine the sex because the Shettles Method is uses to determine the sex of a baby.The statement d is correct as the hair have different structural features like length which makes its morphological characteristics.