List the three major groups of pinnipeds and outline the anatomical differences between them
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The pinnipeds families include Otaridae (eared seals), Phocidae (true seals), and Odobenidae (walruses). In the eared seals external ears are present and the hind limbs of these pinnipeds rotate at right angles to the body, which facilitates walking on land. In the true seals and walruses, there are no external ears. True seals are also not capable of rotating their hind limbs forward so these animals are rather clumsy on land. Walruses are the largest of the three pinnipeds and have tusks.
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Which statement is true?
a. Blood flows from areas of high hydrostatic pressure in the arterioles to low hydrostatic pressure in the arteries. b. Blood flows from areas of low hydrostatic pressure in the arterioles to high hydrostatic pressure in the arteries. c. Blood flows from areas of high hydrostatic pressure in the arteries to low hydrostatic pressure in the arterioles. d. Blood flows from areas of low hydrostatic pressure in the arteries to high hydrostatic pressure in the arterioles.
What conclusions are consistent with these data? (Select all that apply.)
A researcher is studying the rII locus of phage T4. Three rII- strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(?) is coinfected with two rII- strains simultaneously and the results are recorded. Infection with A and B phage = plaques form Infection with A and C phage = plaques form Infection with B and C phage = no plaques form Infection with B and D phage = no plaques form Infection with C and D phage = no plaques form In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(?). Progeny of A and B phage = plaques form Progeny of B and C phage = plaques form Progeny of C and D phage = plaques form Progeny of B and D phage = no plaques from A) Strains B and D both carry the same mutation. B) Strains B, C, and D carry mutations in the same gene. C) Strain A carries a mutation in a different gene than strains B, C, and D. D) Strains A and B carry mutations in the same gene. E) Strains B and C both carry the same mutation. F) A, B, C, and D carry mutations in the same gene.
In cystic fibrosis, two unaffected carriers can have a child with the disease. It is as common in boys as in girls. This disease is Select one:
a. X-linked dominant. b. X-linked recessive. c. autosomal recessive. d. pleiotropic. e. autosomal dominant.
The loop of Henle relies on a countercurrent exchange mechanism to promote movement of water and solutes. Explain the significance of this mechanism to the composition of urine
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