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which of the structures listed below releases the oocyte?
a) primordial follicleb) mature (graafian) folliclec) zona pellucidad) thecca folliclee) secondary follicle
Beaker A contains 25 percent salt solution. A differentially permeable bag (permeable to water not salt) containing 50 percent salt solution is allowed to float on top of the solution in Beaker A. What will occur.
Plants may be 10, 20, 30, 40, 50, 60 or 70 cm high where plant high is under polygenic control. A true-breeding plant that is 10 cm is crossed to another true-breeding plant that is 50 cm.
Calculate the number of alpha-helical turns present in the same DNA molecule given above, given that the average molecular weight of a complementary pair of nucleotides is 618 grams per mole,and there are 10 nucleotide pairs per turn of the double..
To stain your cells, you need to apply 0.75mL of staining solution to the fixed cells. How much is this in uL.
The brown and scarlet mutations assort independently. If fruit flies that are heterozygous for both of these mutations are intercrossed, what sorts of progeny will they create, and in what proportions? Describe how you got the answer.
Early in development, most human cells turn off expression of essential component of telomerase, enzyme responsible for addition of telomere repeat sequences (5' TTAGGG 3') to the ends of chromosomes.
What is the cellular/molecular mechanism to make yeast chemically competent? Compare and contrast the molecular mechanisms of yeast and bacterial transformations.
Some evolutionary biologists have argued that the neutral theory should be taken as the null hypothesis to explain genetic variation within species or populations and genetic differences among them.
Imagine a large island with many clipbirds. On that island, 25% have large beaks, 50% have medium beaks, and 25% have small beaks. Far away.
After graduation you and 19 friends build a raft, sail to a deserted island, and start a new population, totally isolated. Two of your friends carry but not have the recessive blue polkadot allel.
The genes for vermillion (v) eyes, sable (s) body color, and forker (f) bristles are on the X-chromosome of Drosophile melanogaster. They map in the order of v, s, f, with 10 map units between v and s and 14 map units between s and f.
During interphase the DNA is not visible through a microscope; it only becomes visible as chromosomes during mitosis. Why isn't the DNA visible during interphase and why would this be the case?
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