Which of the following is an example of secondary structure in a protein?
A) a particular amino acid sequence
B) an alpha helix
C) a globular shape
D) the joining of two polypeptide chains
Answer: B
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How do immune cells with sensitivity to self-antigens become eliminated?
A. They are lysed through the action of membrane attack complexes. B. They are destroyed by macrophages. C. They undergo apoptosis. D. They enter a G0 state of cell cycle and cannot replicate.
Primates have a large brain for their body size. Compared to other mammals, primates devote more brain area to ____ and information processing, and less to ____
a. hearing; smell b. emotion; senses c. smell; touch d. vision; smell e. touch; vision
A long-term study on guppies illustrates the effect of predation on life history traits. In this study, what occurred when guppies from streams with cichlids (prey on larger guppies) were moved to streams with killifish (prey on smaller guppies)?
a. Guppies became larger in one generation. b. Guppies became smaller in one generation. c. Guppies became larger over several generations. d. Guppies became smaller over several generations. e. Guppies did not change size.
When some animals mature, they then migrate long distances to their breeding grounds or to escape
harsh weather. A signal for this type of behavior is often:a. a conditioned stimulus. b. day length. c. negative reinforcement. d. a sign stimulus. e. territoriality.