Which environment represents the largest pool of microbial genes?

A. Oceans
B. Soil
C. Humans and animals
D. Freshwater lakes
E. Rainforest


Answer: A

Biology & Microbiology

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Predict the outcome of an F+ to F- mating if the F+ cell lacked a functional tra operon. 

A. Conjugation would not occur because there would be no contact between the F+ and F- cells. B. Upon entering the recipient, the F factor would be unable to integrate into to host chromosome.  C. Conjugation would occur, but the F- recipient could not become Hfr. D. There would be no effect on conjugation.

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The egg-bearing structure of a flower is the

A. anther. B. sepal. C. stigma. D. style. E. ovary.

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In a population of bears, which is most likely to be considered to have the greatest Darwinian fitness?

A) the biggest bear B) the bear having the largest number of mutations C) the bear that blends in with its environment the best D) the strongest, fiercest bear E) the bear that leaves the most descendants

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Which of the following would be least likely to diffuse through a phospholipid bilayer?

A) carbon dioxide B) oxygen C) sodium ions D) water E) the small, nonpolar molecule of butane

Biology & Microbiology