Which sentence describes how the metabolic rate of an endotherm compares with the metabolic rate of an ectotherm as the environment gets colder?
a. The metabolic rate in an endotherm goes down, while the metabolic rate of an ectotherm goes up.
b. The metabolic rate in an endotherm goes down, as well as the metabolic rate of an ectotherm.
c. The metabolic rate of an endotherm goes up, as well as the metabolic rate of an ectotherm.
d. The metabolic rate in an endotherm goes up, while the metabolic rate of an ectotherm goes down.
Ans: d. The metabolic rate in an endotherm goes up, while the metabolic rate of an ectotherm goes down.
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X chromosome inactivation results in the
a. total inactivation of both X chromosomes. b. inactivation of only the paternal X chromosome. c. inactivation of only the maternal X chromosome. d. inactivation of either the paternal X chromosome or the maternal X chromosome. e. nonrandom inactivation of X chromosomes in the initial cells of tissues
Similarities due to convergent evolution are called
A. analogy. B. homology. C. taxonomy. D. phylogeny. E. cladistics.
A cell membrane is said to be a fluid mosaic because
A. there is water in the membrane. B. the membrane is made of lipids and proteins that can move. C. it forms a bilayer. D. transport proteins allow for the movement of water-soluble molecules.
An emu is a flightless bird that still has wings. These wings are an example of
A) mutation. B) adaptation. C) analogous structures. D) homologous structures. E) vestigial structures.