Answer:
Due to more open ecological opportunities on a given island, greater differences occur between island species. A single lineage diversifies rapidly, and descendant populations occupy many habitats and ecological roles.
Explanation:
Which of the following does not occur due to passive transport?
a. the substance moves to an area of lower concentration
b. the concentration of a solution approaches equilibrium
c. the volume of a solution changes due to the movement of water
d. a concentration gradient of a dissolved substance in a solution is created
Option d, the creation of a concentration gradient of a dissolved substance in a solution, does not occur due to passive transport. Passive transport, including diffusion and osmosis, reduces existing concentration gradients, moving substances towards equilibrium.
The question asks which of the following does not occur due to passive transport. Passive transport is the movement of substances across the plasma membrane without any input of energy from the cell. The substances move from an area of higher concentration to an area where they have a lower concentration using this process.
Choices: a. the substance moves to an area of lower concentration, b. the concentration of a solution approaches equilibrium, c. the volume of a solution changes due to the movement of water, d. a concentration gradient of a dissolved substance in a solution is created.
The correct answer is d. a concentration gradient of a dissolved substance in a solution is created. Passive transport, including processes like diffusion and osmosis, involves the movement of substances down their concentration gradient until equilibrium is reached. It does not create a concentration gradient; instead, it diminishes existing concentration gradients as substances move towards equilibrium.
A nonsense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant. In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
Answer:
Removal of introns
Explanation:
the reduction in the sequence is as a result of the removal of introns. Introns are actually non-coding regions and do not code for proteins. they are usually spliced out.
In specialized transduction the bacterial genes transduced tend to be: Select one: a. those genes in greatest use by the bacteria b. those genes that are small enough to fit in the viral head c. those genes that are located close to the site of the pophage insertion d. those genes that are currently not being transcribed
Answer:
c. those genes that are located close to the site of the pophage insertion
Explanation:
In Specialized transduction, a restricted group of bacterial genes is passed to a different bacterium. Here, the prophage excises falsely from the chromosome such that the bacterial genes which are close to the site of the prophage insertion take part in the excised DNA.
Which of the following is the general guideline that IACUCs use to evaluate the potential pain of a procedure conducted with animals?
Answer:
IACUCs ( An institutional animal care and use committee) may be defined as the federal regulations for the institutions in which the animals are used for the research and study purpose.
Some laws, regulations and rules are made for the committees so that they cannot use the animals brutally and illegally. The procedure that might result in the pain and distress in human being can cause same in other animals as well.
Calcium carbonate is most likely to dissolve in water with which characteristics? A.low pressure and cold temperatures B. low carbon dioxide and warm temperatures lots of carbon dioxide and cold temperatures C. lots of carbon dioxide and warm temperatures low pressure and warm temperatures
Answer:
lots of carbon dioxide and cold temperatures
Explanation:
Calcium carbonate has low solubility at room temperature and the solubility increases as the temperature decreases. The solubility of calcium carbonate also increases in water with high level of carbon dioxide due to the formation of more soluble bicarbonate.
[tex]CaCO_3_{(s)} + CO_2_{(g)} + H_2O_{(l)} --> Ca(HCO_3)_2_{(aq)}[/tex]
This is why carbon dioxide rich rainwater is able to erode limestone rocks, leading to the formation of caves, stalactites and other structures in the long run as a result of reversal of the process.
Calcium carbonate is most likely to dissolve in water that is rich in carbon dioxide and has cold temperatures. This is because CO2 reacts with water to form carbonic acid, which can then react with CaCO3 to increase its solubility.
Explanation:Calcium carbonate, CaCO3, is more likely to dissolve in water with characteristics of having lots of carbon dioxide and cold temperatures. Due to its solubility product, Ksp, we know that the solubility increases as the pH decreases (i.e., as acidity increases). The presence of carbon dioxide, CO2, in water leads to the formation of carbonic acid, which results in the following reaction:
H₂O + CO₂ = H₂CO₃
CaCO3 + H₂CO₃ = Ca²+ + 2HCO3⁻
This reaction shows that as carbonic acid is present, calcium carbonate's solubility increases because it reacts with the acid to form more soluble compounds. In natural waters that contain dissolved CO2, the solubility of CaCO3 is enhanced due to the formation of hydrogen carbonate salts. Therefore, waters that are acidic and rich in CO2 are more likely to dissolve calcium carbonate
Heparin reacts to prevent the conversion of prothrombin to thrombin. Heparin:
A) Is available in oral and parenteral formsB) Takes about 72 hours to have a therapeutic effectsC) Has its effects reversed with the administration of protamine sulfateD) Has its effects reversed with the injection of vitamin K
Answer:
The correct option is C) Heparin has its effects reversed with the administration of protamine sulfate.
Explanation:
Heparin is an anticoagulant, that is, it works by decreasing the ability of blood to clot, helping to prevent the formation of clots as well as stopping the subsequent extension of any existing clot. Through the neutralization of thrombin, it prevents the conversion of fibrinogen to fibrin, and thus, prevents the formation of a stable clot by inhibiting the fibrin stabilizing factor.
Protamine sulfate is a heparin antagonist, forming with it inactive complexes without anticoagulant effect, that is, the protamine, in the presence of heparin, which is acidic in nature, through the formation of stable salts, cancels the anticoagulant effect of both substances, neutralizing and reversing the anticoagulant action of heparin.
Heparin's effects are reversed with the administration of protamine sulfate, not vitamin K which is used for warfarin reversal. Heparin works by enhancing the activity of antithrombin III, leading to a decrease in thrombin generation and thus anticoagulation; therefore option C is correct
Heparin prevents the conversion of prothrombin to thrombin by accelerating the inhibition of thrombin by antithrombin III. It binds to antithrombin III, causing a conformational change that greatly enhances its inhibition of thrombin. Therefore, the correct answer to the question is that heparin's effects can be reversed with the administration of protamine sulfate. This is because protamine sulfate is utilized to counteract the effects of heparin in the case of excessive anticoagulation, which is a crucial aspect of managing heparin's therapeutic usage.
Vitamin K is not used to reverse the effects of heparin, but it is used to reverse the effects of warfarin, another anticoagulant that works by inhibiting the vitamin K-dependent synthesis of certain coagulation factors. Unlike heparin, warfarin takes several days to reach its full therapeutic effect and is used for long-term anticoagulation treatment.
Second-generation H1 antagonists cause less CNS depression because they are selective for peripheral H1 receptors and because of which other property?
Answer:
THEIR INABILITY TO CROSS THE BLOOD-BRAIN BARRIER AT THERAPEUTIC LEVELS.
Explanation:
Second-generation antihistamines (e.g., loratadine, terfenadine) lack the ability to pass through the blood-brain barrier at certain therapeutic levels.
Sandra Bem coined the term _____ to describe those people who possess both masculine, or instrumental, and feminine, or expressive, traits.
Answer:
Hello!
The answer is androgyny.
Explanation:
Sandra Bem was a psychologist who studied gender and gender roles. She is famously known for introducing the Gender Schema Theory and the Bem Sex-Role Inventory or BSRI which is a test that classifies individuals on the basis of male and female traits. Bem's work has helped to redefine gender roles in society.Bem stated that each individual has both masculine and feminine traits and their gender roles could be determined on the basis of score on the BSRI. She introduced the androgyny to define people who have an equal number of both masculine and feminine traits on the BSRI.Medical robots are built with ____ capabilities to perform sophisticated surgeries.
Answer: High precision capabilities
Explanation:
Minimaturized tools and high definition three- dimensional cameras are inserted under the skin through an incisions,or without.
The Sugeon synchronize these with the robot outside and manipulate them from a nearby console.
If a white dwarf in a binary star pair is accreting mass and it exceeds the 1.4MSun limit, it will:
Turn into a Neutron Star
Turn into a Black Hole
Turn into a Main Sequence star.
Explode
When a white dwarf in a binary star pair accretes mass and exceeds the 1.4Msun limit, it will explode in a Type Ia supernova.
Explanation:If a white dwarf in a binary star system is accreting mass from its companion and exceeds the Chandrasekhar limit of approximately 1.4 solar masses (Msun), it cannot support itself against gravitational collapse. The core temperature rises as it contracts, leading to a runaway nuclear fusion reaction, particularly of carbon. This process results in a violent explosion known as a Type Ia supernova, during which the white dwarf is completely destroyed, ejecting matter into space at high speeds and leaving no trace of the white dwarf behind.
X-gal is a synthetic molecule which is a substrate for beta-galactosidase (b-gal). When cells are grown on a medium containing X-gal, they turn blue if the cells are expressing b-gal. In the absence of b-gal expression, the cells are white. You are attempting to clone a gene of interest into a lacZ reporter gene of a plasmid and introduce your recombinant molecule into a bacterial host sensitive (i.e. not resistant) to ampicillin. The plasmid contains a gene for ampicillin resistance at a position other than the cloning site. You grow your potential transformants on media containing both ampicillin and X-gal. Which of the following results would most likely indicate a successful clone?
cells which form blue colonies on the ampicillin plates
cells which form white colonies on the ampicillin plates
cells which form light blue (half blue, half white) colonies on the ampicillin plates
cells which do not grow on the ampicillin plates
None of the above results would indicate a successful clone.
Answer:
The correct answer is "cells which form white colonies on the ampicillin plates".
Explanation:
X-gal staining, also known as blue–white screen, is a common approach to detect colonies that express the gene of interest that has been incorporated into its genome. The basis of this technique is introducing the gene of interest into a vector that interrupts the expression of beta-galactosidase, which means that in a medium with X-gal the cells that were successfully transformed will be white. In this case, the cells that are transformed will also be resistant to ampicillin. Therefore if they growth in a media with both ampicillin and X-gal, a successful clone will form white colonies.
Your roommate, who has not studied climate, says, "I thought the greenhouse effect was a bad thing. Isn't it what's causing global warming?" Which of the following statements might you use to help your roommate understand the true nature of the greenhouse effect?Select the two that apply.
A. Some gases, like carbon dioxide and water vapor, "trap" the heat radiated by Earth, causing warming.
B. Earth would be more livable without the greenhouse effect.
C. When there are more greenhouse gases in the atmosphere, the greenhouse effect is stronger.
D. Carbon dioxide is the only greenhouse gas that matters.
Answer:
Option (A) and (C).
Explanation:
Greenhouse effect increases the earth's temperature every year. This causes the melting of glaciers and causes flood situation in the plain areas and allows the persistence of harmful gases in the atmosphere.
Greenhouse gases has the ability to trap the heat of the sun radiated by the planet. These greenhouse gases includes carbon dioxide, carbon monoxide, water vapor and methane. These green house gases increases the effect of the greenhouse.
Thus, the correct answer is option (A) and (C).
Final answer:
The greenhouse effect is a natural process that involves certain gases in the Earth's atmosphere trapping heat, allowing the planet to maintain a habitable temperature. However, increased greenhouse gas concentrations, such as carbon dioxide, from human activities have caused an enhanced greenhouse effect, resulting in global warming and climate change.
Explanation:
A. Some gases, like carbon dioxide and water vapor, "trap" the heat radiated by Earth, causing warming.
C. When there are more greenhouse gases in the atmosphere, the greenhouse effect is stronger.
The greenhouse effect is a natural process in which certain gases in the Earth's atmosphere trap heat, preventing it from escaping into space. This process is essential for maintaining a habitable temperature on Earth. However, human activities have increased the concentration of greenhouse gases, such as carbon dioxide, which has resulted in an enhanced greenhouse effect, leading to global warming and climate change.
In which muscles is overactivity or tightness common for individuals who regularly wear high heels?
Answer: Gastrocnemius, soleus, and Achilles tendon
Explanation:
The heel cord or achilles tendon is also known as calcaneal tendon is found at the back of the leg and is known to be the thickest bone in the human body.
It is attached to the plantaris, calf muscles (gastrocnemius) and soleus muscles. A person who wears heels regularly for a longer period of time suffers from pain and inflammation in muscles of leg.
These muscles helps in the walking and other movements of the legs. Wearing heals and walking is quite painful.
Foreign proteins that gain access to the body through cuts and scrapes, through the digestive or circulatory systems, or through the urinary and reproductive systems are called ____.
1. mineralocorticoids
2. immunoglobulins
3. antigens
4. antibodies
Answer: option 3) antigens
Explanation:
An Antigen is any FOREIGN substance that can enters the body stimulating an immune response. It includes toxins, proteins etc, and can get into the body through ANY openings.
Therefore, antigen is the right answer
Foreign proteins that enter the body through various ways are called antigens. They trigger an immune response, leading to the production of antibodies.
Explanation:Foreign proteins that gain access to the body through cuts and scrapes, through the digestive or circulatory systems, or through the urinary and reproductive systems are called antigens. An antigen is a substance that triggers an immune response, especially the production of antibodies. Mineralocorticoids refer to a class of hormones that maintain salt and water balance and regulate blood pressure. Immunoglobulins are another name for antibodies, proteins produced by the immune system to neutralize harmful foreign substances like antigens. On the other hand, antibodies are proteins produced by B cells as a defense against antigens.
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What is the function of bile and where does it enter the digestive tract
Answer: emulsification of fats to tiny globules for easy digestion and absorbtion in the villii.
It excretes bilirubin.
It neutralizes acidic Chyme.
It enters at the duodenum to act on Chyle.
Explanation:
Imagine that you are a graduate student working in a cancer lab. You accidentally mix unlabeled tubes of carcinoma cells with tubes of normal epithelial cells. Which of the following is NOT a possible strategy to allow you to distinguish which tubes contain carcinoma cells?
Answer:D.D.) Suspend the cells in liquid agar culture and monitor which culture continues to grow.
Explanation
Options A-C are correct except D.
→Increase in Telomere length is indicative of abnormal growth, cancer cells can reactive telomerase to increase cell's length.
→Once a monolayer is reached; this a stage of a complete normal cell division , a cell that goes beyond this stage must be mutated. assuming all other factors are constant .
Uncontrolled cell division is an indication of virulent growth in mutated cells.
Cancer cell requires a ,medium of living host to thrive, alga medium will not support growth for carcinoma cells -the correct answer.
Completed Que.
:Imagine that you are a graduate student working in a cancer lab. You accidentally mix unlabeled tubes of carcinoma cells with tubes of normal epithelial cells. Which of the following is NOT a possible strategy to allow you to distinguish which tubes contain carcinoma cells?
A.)Monitor telomere length over time during multiple cell divisions.
B.) Plate the cells in culture and look for the culture that stops dividing once a monolayer is reached.
C.) Monitor the rate of cell division.
D.) Suspend the cells in liquid agar culture and monitor which culture continues to grow.
"In which type of disorder do feelings of apprehension or tension occur without an obvious external cause, affecting daily functioning?"
Answer:
B) you dont
Explanation:
Generalized Anxiety Disorder (GAD) is the type of disorder in which feelings of apprehension or tension occur without an obvious external cause, affecting daily functioning.
Explanation:The disorder in which feelings of apprehension or tension occur without an obvious external cause, affecting daily functioning is called Generalized Anxiety Disorder (GAD).
GAD is a mental health disorder characterized by excessive and persistent worry about various aspects of life, even when there is no apparent reason to be anxious. Symptoms of GAD may include restlessness, irritability, difficulty concentrating, muscle tension, and sleep disturbances.
For example, a person with GAD may frequently feel anxious about upcoming events or situations and experience physical symptoms such as a racing heart, shortness of breath, or a knot in their stomach, making it difficult for them to carry out their daily activities.
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The cells involved in innate immunity, whose absence increases the chances of developing malignant tumors, are _____.
A) cytotoxic T cells
B) natural killer cells
C) macrophages
D) B cells
Answer:
The correct option is B (natural killer cells).
Explanation:
Natural killer cells: They are defined as the type of cytotoxic lymphocyte which are critical to the innate immune system. The NK cells play an important role in to provide rapid response to tumor formation, virus infected cells, and acting after three days of infection.
While cancer cells die, they release some antigens, than these antigens are recognized by the immune system, and later they are presented on the immune cells which are known as antigen presenting cells. So, if these cells are absent than they increase the chances of developing malignant tumors.
Now, explain why ice floats. Why is 4o C the critical temperature in this story?
Answer:
Ice is less dense than water.
Water freezes at 4°C as a result of a lower number of hydrogen bond preventing the molecules from interacting. This yields ice of about 10% lower density when compared to water
Explanation:
Ice floats on water because it is less dense than water.
Water form more fixed stable hydrogen bond when it freezes preventing it from forming further hydrogen bonds or closeness with neighbouring water molecules. This explains why ice has a lesser density than liquid water when compared with most substances that has higher density in its solid form than in its liquid form.
Note:
Only At 4°C
Water is more dense
At a temperature greater than 4°C
Water is less dense
At a temperature lower than 4°C
Water is less dense
Many organisms can reproduce asexually through mitosis, while other organisms reproduce sexually, and their cells carry out meiosis to form gametes. In a situation where an organism falls prey to many efficient predators, which of these processes would be most beneficial to a species?a) Meiosis: numerous daughter cells produced would increase the species' population.b) Meiosis: genetic variation would reduce the species' survival.c) Mitosis: numerous offspring would increase the odds that some of them would survive.d) Mitosis: numerous genetic mutations would help some individuals of the species.
Answer:
C
Explanation:
Mitosis is a growth division unlike meiosis which an organism undergoes to produce gametes or sex cells during sexual reproduction.
Mitosis is a kind of cell division that results in two daughter cells, identical in genetic composition. An organism can undergo mitosis in asexual reproduction. For each mitotic division, two daughter cells emerge (duplication division), which will propagate the number of the species.
In a case of heavy predation, the prey organism will depend on diverse number to keep its species from getting extinct. Hence, undergoing mitosis to duplicate itself asexually will be most beneficial in this scenario as a large number will increase the chance that some of them will not be a victim of predation.
Jessie and Joe are both carriers of the sickle cell trait which causes sickle cell disease when present in the recessive form. What is the likelihood that they will have 2 children, both of whom have the disorder?
Answer: 50% 50% Each.
Explanation:
Since both of the parents are recessive the gene will surely affect one but it's a chance of who.
Which statement best expresses the relationship between the three structures represented below?(1) DNA is produced from protein absorbed by the cell.(2) Protein is composed of DNA that is produced in the cell.(3) DNA controls the production of protein in the cell.(4) Cells make DNA by digesting protein.
Answer:
Option number 3 that is DNA controls the production of proteins in the cell is the best relationship between the three structures which are DNA, Protein and cell.
Explanation:
DNA is an important part of every prokaryotic and eukaryotic cell. DNA stands for Deoxyribonucleic Acid. It is a long molecule made up of multiple single units called a Nucleotide. Each nucleotide contains a phosphate group (PO4), a sugar group and a nitrogenous base. DNA is composed of two long chains that wind around each other to form a double helical structure that contains genetic instructions and information regarding the development, functioning, growth and reproduction of all organisms known. This is all achieved via formation of proteins through a process known as Transcription and Translation.
Information about a particular protein formation is transcribed from a DNA into mRNA known as Transcription which is then translated into a molecule known as Protein in a process called Translation. This is how DNA controls the production of Proteins in the cells.
As far as other options in the asked question are concerned, DNA is not formed from protein but rather derived from linking up of nucleotides.
Proteins are not composed of DNA but are made up of building blocks which are known as Amino Acids. Amino Acids are organic molecules which have both a carboxyl (-COOH) and an amino (-NH2) group.
Cells do not make DNA by digesting proteins, rather proteins are degraded back into Amino acids when digested.
Final answer:
The correct statement is '(3) DNA controls the production of protein in the cell.' This reflects the core understanding of molecular biology, where DNA contains the genetic information that directs protein synthesis within the cell.
Explanation:
The correct statement that best expresses the relationship between the three structures represented in the question is: DNA controls the production of protein in the cell. This concept is a fundamental tenet of molecular biology, known as the Central Dogma. It expresses how genetic information is transcribed from DNA into mRNA (a process called transcription), and mRNA is then translated by ribosomes in the cytoplasm into proteins (a process called translation).
DNA is the hereditary material present in all cells and holds the instructions for producing proteins. Proteins, which are synthesized by ribosomes in the cytoplasm, are composed of amino acid sequences determined by the genetic code found on the DNA. The synthesis of proteins is an intricate process that starts with the DNA in the nucleus of the cell and is of vital importance because proteins perform a wide array of functions within living organisms, including acting as enzymes, signaling molecules, and structural components.
The protein part of an enzyme which requires a coenzyme/ cofactor to function is called a(n):__________
Answer:
Explanation:
See the illustration below:
APOENZYME + COFACTOR/COENZYME = HOLOENZYME
Note: All known enzymes are proteins
Apoenzyme is the protein portion of the enzyme.
COFACTOR is the added portion to make a BIOLOGICALLY ACTIVE enzyme known as Holoenzyme.
A cell is treated with a drug that prevents the formation of new lysosomes. The cell continues to transcribe the genes that code for the hydrolytic enzymes that are normally found in lysosomes and continues to translate the mRNAs for those proteins on membrane-bound ribosomes.
The hydrolytic enzymes are most likely to accumulate in which of the following cellular structures?
a. Nucleus
b. Mitochondrion
c. Smooth endoplasmic reticulum
d. Golgi Apparatus
Answer:
Explanation:
The correct answer is D: Golgi apparatus.
In principle, the lysosomes are the responsible for accumulating of hydrolytic enzymes, so if the drug did not prevent the formation of lysosomes, the accumulation of hydrolytic enzymes would be in charge of the lysosomes.
But in the statement it says that the drug with which the cell is being treated prevents the formation of lysosomes, and in this case, the organelle that is most likely to perform the function of accumulating hydrolytic enzymes is the golgi apparatus.
The cellular structure that the hydrolytic enzymes would most likely accumulate is the: d. Golgi Apparatus.
The Golgi apparatus main function is to synthesize proteins. The proteins from the endoplasmic reticulum are received by the Golgi apparatus which processes them further.
The Golgi apparatus sorts proteins as well as transport the sorted proteins to their various destinations.
Materials that are to be removed from the cell are modified and processed by the Golgi apparatus before packaging them for transport out of the cell.
Since the genes for coding hydrolytic enzymes in absence of the lysosomes, where these hydrolytic enzymes would normally be found, the most likely cellular structure where the hydrolytic enzymes would accumulate is the Golgi apparatus.
The hydrolytic enzymes would be accumulated and sorted out in the Golgi apparatus.Therefore, the cellular structure that the hydrolytic enzymes would most likely accumulate is the: d. Golgi Apparatus.
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You strip off all proteins on the cell surface by using a protease (an enzyme that destroys proteins). Now, when you add a specific signaling molecule, the cell still responds. What is the most reasonable explanation of this?
Answer:
This is because the receptor is in the interior of the cell
Explanation:
When a specific signaling molecule is added to a cell whose cell surface has been stripped off by proteins the cell still responds because the receptor is in the interior of the cell.
Receptors are divided into two categories which are;
Intracellular receptors or internal receptors which are found in the cytoplasm or nucleus of the cell. They respond to hydrophobic ligand molecules which are able to travel across the plasma membraneCell surface receptors which are found in the plasma membraneSignalling molecules are necessary for the coordination of cellular responses by serving as ligands and binding to cell receptors.
A type of signaling molecule are the small hydrophobic ligands which can directly diffuse through the plasma membrane and interact with internal receptors unlike the water soluble ligands. This is why the cell still responds after you strip off all proteins on the cell surface.
NOTE: Nitric oxide (NO) is a gas that also acts as a ligand, therefore it can pass through the plasma membrane of the cell and interact with receptors.
The cell likely responds to the signaling molecule through an intracellular receptor since the signaling molecule can still trigger a response after cell-surface proteins are stripped away by proteolysis.
The most reasonable explanation for a cell responding to a signaling molecule after all proteins have been stripped from the cell surface by a protease might be that the signaling molecule interacts with an intracellular receptor. Since proteolysis only affects proteins on the cell surface, and the cell still responds, this suggests that the signaling molecule is likely small and hydrophobic, allowing it to cross the cell membrane and bind to an intracellular receptor instead. This interaction alters the receptor's shape or activity, thereby triggering a response within the cell without the need for cell-surface receptors.
Which condition is characterized by excessive destruction of circulating red blood cells?
Answer:
Answer is hemolytic anemia.
Explanation:
Hemolysis is the destruction of red-blood cells, while anemia when the amount of the red blood cells in the body is lower than the expected or normal.
Therefore, hemolytic anemia can be defined as a disorder or situation where the rate at which the red blood cells are destroyed is faster compared to the rate at which they are made or produced.
This can be caused by bone marrow failure or infections, and inherited blood disorder like sickle cell disease.
The hemolytic anemia is a serious disorder that can damage the heart and other organ of the body, this is because of oxygen starvation, since the red blood cells responsible for carrying oxygen around the body have been affected.
Eating some food items like beans, green vegetables, red meat and legumes can increase red blood cell count.
Jorge made a model of a cell in a clear plastic zipper bag. He used a plum for the nucleus and kidney beans for mitochondria. Why is this model helpful for learning about cells? A. It is made of the same materials as a real cell. B. It can function like a real cell. C. It contains all the same parts as a real cell. D. It is larger than a real cell.
The model of the cell prepared here is much bigger than the real cell which is microscopic. So its helpful for studying the structures of the real cell.
Option D.
Explanation:The cell is defined to be the structural and functional unit of an organism. The cell contains different organelles that remain covered in one place i.e demarcated by cell membrane. Inside it there are different organelles like nucleus, mitochondria, ribosome, golgi bodies, lysozome etc. The sizes of these organelles are different. All these organelles are microscopic which makes the visualization of these organelles difficult. So making a model with comparative sizes and structures makes the studying easy for them. Thus this model is very helpful.
Answer:
d
Explanation:
It is larger than a real cell.
If the e and f genes are expressed, the Xi chromosome will be prevented from reaching 100% frequency if selection pressures cause which of the following to be true?
Answer:
The options
A. XsXs flies have the lowest fitness of any genotype.
B. XsXs flies have the highest fitness of any genotype.
C. XiY flies and XsY flies have equal fitness.
D. XiXs flies and XsXs flies have equal fitness
The CORRECT ANSWER IS
a. XsXs flies have the highest fitness of any genotype.
Explanation:
From the text:
Xi will have a frequency of 100% as far as the Xi bearing genotype is not picked. Options C and D are wrong since not being picked is equal to same fitness level.
The amount of Xs in relation to Xi population will increase as long as XsXs genotype as the largest fitness and there is difference in fitness between the other genotypes
A high-fiber diet might help decrease blood cholesterol levels by preventing ketosis. keeping stools soft. trapping cholesterol in pockets in the large intestine. causing fiber to bind with cholesterol to be excreted.
A high-fiber diet might help decrease blood cholesterol levels by
a) preventing ketosis
b) keeping stools soft
c)trapping cholesterol in pockets in the large intestine
d)Causing fiber to bind with bile and more cholesterol to be excreted
Answer:
Causing fiber to bind with bile and more cholesterol to be excreted
Explanation:
High fiber diet include whole grain cereals, fruits, vegetables, nuts and potatoes etc., when consumed,they bind with cholesterol to aid degeneration in order for excretion to occur. They aid digestion and increase bowel movement, helps the body to lose weight, stay full longer, and improve health.
In an embryonic vertebrate, the apical ectodermal ridge (AER) is a thickened area at the tip of the bud. The cells of the AER secrete protein signals that promote limb-bud outgrowth, and removing the AER blocks growth of the limb along the proximal–distal axis. How would the forelimb of an embryo develop if the AER was removed early or late in limb development?
Answer:
Explanation:
The Removal of the AER results in the cessation of limb bud out-growth and a truncated proximal–distal (PD) axis
The earlier the AER is removed, the more truncated the resulting limb is, with only the very proximal structures (humerus) forming
The later the AER is removed, the less truncated the resulting limb is, with the more distal structures forming (humerus and radius/ulna)
Which is a process
Called Zone model