Mutations that arise in nature, from no particular artificial agent, are called ________

A) chromosomal losses
B) induced mutations
C) nutritional mutations
D) spontaneous mutations
E) cosmic mutations


Answer: D

Biology & Microbiology

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Infaunal organisms live in the water column

Indicate whether the statement is true or false

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In this depiction of transcription (accompanying figure), the ____ strand is ____ because it ____

a. upper; RNA; contains guanine b. upper; RNA; contains uracil c. lower; RNA; contains thymine d. upper; RNA; has no uracil e. lower; DNA; contains adenine

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When biologists use an optimality model to predict foraging behavior, they assume that animals behave in a way that

a. maximizes energy gained over time. b. maximizes reproductive success over a lifetime. c. maximizes immediate reproductive success. d. maximizes the probability of survival. e. I don't know the answer.

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Which factors may result in a normal microbiota species causing disease?

A) invasion of other tissues by the microbiota species B) dysbiosis due to antibiotic therapy C) dysbiosis due to antibiotic therapy or invasion of other tissues by the microbiota species D) dysbiosis due to antibiotic therapy or immune system attack on the host's own tissue E) immune system attack on the host's own tissues

Biology & Microbiology