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Selective pressure is often thought to occur within the coding region of a gene but when the sum of Ka/Ks for each position is calculated, no positive selection is shown. Why is this? Can you think of a way to show positive selection in such a gene region?
Suppose that a team of scientists exploring in the Amazon discover various novel species of bacteria that use a non-standard nucleotide "X" in DNA.
The plot of novelist Rose Darkly's current work in progress, Despair at the Heat Death Cafe, revolves around the production of the "energy currency" of the cells of an alien species. What is one advantage of using E. coli for genetic engineering?
In the region where both species co-occur the northern snuffle has a relatively wide and short snuffle whereas the southern snuffle has a long and relatively thin snuffle. In areas where they occur alone the morphology of their snuffle is fairly s..
What is the piston height h if the temperature is 30 degrees? How far does the piston move if temperature is increased by 200 degrees.
Galactosemia is an autosomal recessive human disease that is treated by restricting lactose and glucose in the diet. Susan Smithers and her husband are both heterozygous for the Galactosemia gene.
Consider the HIV enzyme called protease. The amino acid residues at the active site are highly hydrophobic. In designing a drug that would bind to the active site and jam it, researchers should use which sort of molecule.
Medical history elicits the facts that she lost her husband six months previously, has been extremely depressed, and is taking sleeping pills and not eating properly. What would doctor hypothesize about the probability of senile dementia in this case..
Compute the surface-area-to-volume ratio of a cube whose sides are 100 um in length to estimated the surface-area-to-volume ratio of the fern spore cell.
A 14-residue peptide, TRWVKVNGKWIKQA, in the context of a protein forms a hairpin, consisting of two anti-parallel ?-strands connected by a turn.
There is a population of 100 frogs. Twenty are heterozygotes, 30 are homozygous recessive, 25 are homozygous dominate. What is the frequency of the dominate allele?
A particular variety of corn has a gene for kernel color and a gene for height with the phenotypes CC,Cc: purple kernel.
Assume you are an ecologist studying the effects of acid precipitation on plant life. Explain an experiment you would perform in order to determine which plant species will be a useful indicator species for acid rain pollution.
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