Which one of the following proteins is not required at low, basal levels for the regulation of the expression of the lac operon?

A. thiogalactoside transacetylase
B. galactoside permease
C. ?-galactosidase


A

Biology & Microbiology

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Which of the following will not result from site-specific recombination?

A. inversion B. deletion C. insertion D. translocation E. All of the choices given can occur.

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Echinoderms include _______.

a) insects and crustaceans b) tapeworms and planarians c) jellyfish and sea anemones d) snails, clams, and squids e) starfish and sea urchins

Biology & Microbiology

If a larva of Echinococcus granulosus is found in humans, humans are the

A) definitive host. B) infected host. C) intermediate host. D) reservoir. E) None of the answers is correct.

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Which of the following occurs during metaphase?

A. Chromosomes are about 30 nm wide. B. Heterochromatin is converted to euchromatin. C. The "beads on a string" structure is visible. D. Chromosomes undergo gene transcription. E. Chromosomes are much shorter than they were in interphase.

Biology & Microbiology