Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?

A. Attenuation
B. Repression
C. Catabolite repression
D. All of the choices are correct.


Answer: C

Biology & Microbiology

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If one reproductive strategy of a eukaryotic organism is gamete fusion, what can be concluded about that organism? 

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As part of aerobic respiration, O2 is reduced and loses electrons, and glucose (C6H12O6) is oxidized and gains electrons

A. true B. false

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How can one distinguish between annuals, biennials, and perennials?

A. How tall they grow. B. The number of flowers they produce. C. The amount of root development. D. The environment they grow in. E. The time from seed germination to seed production.

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Which of the following is/are TRUE regarding the antidepressants?

a. Tricycles compound causes side effects due to lack of specificity against various transporters b. "MAO inhibitors" inhibits oxidation of NE (norepinephrine) and 5HT c. Lithium passes Na+ channel and interferes with adenylate cyclase d. all of above e. b and c

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