The ovarian cycle produces a(n) ____
a. mature egg
b. parthenogenic egg
c. embryo
d. endometrium
e. mature somatic cell
ANSWER: a
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Where in the mammalian kidney should you expect to find cells with the highest concentration of
osmolytes such as sorbitol?
a. renal pelvis b. renal cortex c. Bowman's capsule d. collecting ducts e. renal medulla
Research on HIV vaccines is progressing, but success to date has been limited to vaccines that are of limited
effectiveness against a few strains of the HIV virus. However, flu vaccines are similar in their limitations. Why are ‘limited effectiveness flu vaccines released, but not HIV vaccines? What will be an ideal response?
A powerline cut has isolated 50 sowbugs from its original population of 15,000. After only five generations, the new population exhibits dramatic genetic differences from the original one, most likely because:
a) members of a small population tend to die off more quickly, removing alleles from the gene pool. b) gene flow increases in a new environment. c) the new environment is different from the old, favoring natural selection. d) by chance, the allele frequencies of the isolated sowbugs differed from those in the original population, and subsequent genetic drift caused further divergence from the original gene pool. e) mutations are more common near a powerline.
Capsules of pathogenic enteric bacteria are virulence factors because they _____.
A) Capture iron from hemoglobin and store it in the bacteria B) Release hemolysins that destroy red blood cells C) Produce fimbriae that enable the bacteria to attach to human cells D) Protect the bacteria from phagocytosis and from antibodies