A dog cowering every time its abusive owner approaches is an example of ________.
a. a fixed action pattern
b. instinctive behavior
c. None of these choices
d. imprinting
e. habituation
e
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Substitution of one base pair for another in a coding region of a gene can result in a ____ mutation
where the changed codon codes for a different amino acid than was previously coded for.
a. missense b. chromosomal c. frameshift d. silent e. nonsense
Which of the following statements about signal propagation is true?
a. Signaling pathways are simple and linear. b. Signaling pathways can randomly be disrupted by internal errors and will automatically reset. c. Signaling pathways can get very complicated because most cellular proteins can affect different downstream events. d. Mutations have no effect on propagation of signaling pathways.
Gene flow between organisms of ring species occurs
a. between any of the organisms if they are placed in the same environment. b. freely. c. never. d. only between intermediary populations. e. only under laboratory conditions.
Which characteristic is associated with a benign tumor?
a. rapid growth b. poor cell differentiation c. expansion within the same tissue d. severe dysplasia e. metastasis