Describe two characteristics of capillaries that aid in their function as the site for exchange between blood and interstitial fluid
What will be an ideal response?
1 . Capillaries have the smallest diameter of vessels and are lined by only a single layer of endothelium. In some areas there are also spaces between endothelial cells. These characteristics aid in exchange via diffusion or transport across the cell membrane.
2 . Blood flows very slowly through capillaries. The more time blood spends in a capillary, the more time it has for those exchanges to take place.
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Avery, MacLeod, and McCarty showed that DNA was the transforming principle when they mixed
dead virulent bacteria and live avirulent bacteria after treating with a DNA degrading enzyme, injected this into mice, and observed that the mice survived. If RNA were the genetic material, what would have been the effect on the mice after treating with a DNA degrading enzyme and why?
What will be an ideal response?In a large experimental Drosophila population, the relative fitness of a recessive phenotype is calculated to be 0.90, and the mutation rate to the recessive allele is 5 x 10^-5. If the population is allowed to come to equilibrium, what allele frequencies can be predicted?
a. q hat = 0.5 and p hat = 0.5 b. q hat = 0.22 and p hat = 0.78 c. q hat = 0.022 and p hat = 0.978 d. q hat = 0.000055 and p hat= 0.999945
Which of the following best defines a mutation?
a. by-product of natural selection b. permanent change in a DNA sequence c. harmful change in a DNA sequence d. mistake created by faulty mismatch repair
The two hormones involved in seed germination and seed dormancy are
A) auxin and ethylene. B) gibberellin and auxin. C) ethylene and cytokinin. D) abscisic acid and gibberellin. E) cytokinin and auxin.