Cats cannot synthesize the amino acid taurine. This means that in cats, taurine
A. is not a required nutrient.
B. is an essential amino acid.
C. must be stored in cellular compartments.
D. is not present in their normal diet.
B. is an essential amino acid.
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The graph here shows the results of Jacob and Monod's first experiments with betagalactosidase and lactose in E. coli. If beta-galactosidase were unstable in the absence of lactose (one of the hypotheses they tested), what results would you expect to see?
A. the results shown in the graph B. an increase in beta-galactosidase after lactose is removed C. a decrease in beta-galactosidase after lactose is removed D. an initially high level of beta-galactosidase at the beginning of the experiment, with a steady decline over time E. None of these choices are correct.
The production of root hairs is mostly dependent on
A. auxin production. B. position of an epidermal cell. C. width of the root. D. length of the root. E. position of the root in the soil.
Respiratory surfaces in all vertebrates have all of the listed features except
A. moist epithelia. B. large surface areas. C. thick epithelia. D. a very high degree of vascularization.
The California newt is found only in California. This is an example of a(n) ________ species
A) ubiquitous B) metapopulation C) endemic D) invasive