Although females prefer males with the longest tails, very long tails are typically not found
among males in their natural environment. Why might this be the case?
a. Male birds with very long tails are easily captured and eaten by predators, so they do not
survive to reproduce.
b. Male birds prefer having shorter tails.
c. Mutations have kept tail lengths from increasing.
d. There is no advantage to having increased tail length in the natural environment.
A
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Which of the following molecules would not readily cross an intact cell membrane by simple diffusion?
A) water B) glucose C) oxygen D) fatty acids E) ethanol
Which is the predominant life cycle phase of the Moon Jellyfish seen here?
When the end product of a pathway inhibits catalysis of the first step of that pathway, this phenomenon is called
A. feedback inhibition. B. metabolic channeling. C. reversible covalent modification. D. non-competitive inhibition.
. For a woman to get pattern baldness she must ____
a. have the SRY gene b. be younger than 40 years old
c. possess two copies of the allele d. have a sex-limited chromosome arrangement e. have Y inactivation