If a strain of bacteria had a mutation that blocked expression of the lac repressor, what would you expect as a result?

A. The mutant strain would act the same, because it would still require lac activator protein to turn on.
B. The mutant strain would waste energy producing enzymes in the absence of lactose.
C. The mutant strain would grow at the same rate as wild-type if lactose was not present.
D. The mutant strain would outcompete wild-type strains, since it could always utilize lactose.


Answer: B

Biology & Microbiology

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As deoxygenated blood (blood lacking oxygen) enters the heart, list the following structures in the

correct order.

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Indicate whether the statement is true or false.

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Euglena have chloroplasts and can perform phagocytosis. Euglena would be considered which of the following?

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