In the figure above, the two strands have
separated in step "b" because
a. the sugar-phosphate bonds were broken.
b. the hydrogen bonds between bases were
broken.
c. energy from primers pushed the bases
apart.
d. the bases, being negatively charged,
repelled each other.
e. proteins were inserted between each pair of
bases.
B
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A fever augments the host's defenses by
A. enhancing microbiostasis. B. enhancing the activity of the immune system. C. stimulating leukocytes into action. D. All of the choices are correct.
The gene for human insulin has been successfully cloned in
A. S. aureus. B. E. coli. C. rhinovirus.
Hagfish (Eptatretus cirrhauts) are a jawless marine vertebrate that are isotonic with their environment and are considered to be osmoconformers. How might this interesting adaptation limit the habitat that the hagfish can tolerate?
A) Hagfish are not limited by salinity. B) Osmoconformers do not face the same pressures as osmoregulators and can live in any marine environment. C) Individual hagfish will adapt to different salinities over their lifetime and, therefore, can inhabit any marine environment. D) Hagfish habitat is limited by the salinity of the environment.
In a marine ecosystem with an inverted biomass pyramid, which trophic level should have the smallest number of organisms?
A. zooplankton B. phytoplankton C. secondary carnivores (tuna) D. primary carnivores (sardines) E. detritivores