HW_Ch 13 - HW Ch 13 MCQ 1 If Escherichia coli is cultured in broth containing both glucose and lactose it A uses glucose preferentially until the

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HW: Ch 13 MCQ: 1) If Escherichia coli is cultured in broth containing both glucose and lactose, it A. uses glucose preferentially until the supply is exhausted, then uses lactose. B. uses lactose preferentially until the supply is exhausted, then uses glucose. C. uses glucose and lactose simultaneously. D. uses only the glucose (it cannot use lactose as a source of carbon). 2) __________ alter repressor proteins thereby increasing the rate of transcription initiation. A. Inducers B. Corepressors C. Effectors D. Modulators 3) Enzymes that are expressed at a constant level all the time are said to be: A. inducible. B. repressible. C. constitutive. D. attenuated. 4) Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli ? A. repression B. catabolite repression C. attenuation D. all of the choices 5) When bound to the DNA, the repressor protein usually prevents attachment of the RNA polymerase to the __________. A. operon
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This note was uploaded on 02/04/2012 for the course BIO 326R taught by Professor Whiteley during the Spring '08 term at University of Texas at Austin.

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HW_Ch 13 - HW Ch 13 MCQ 1 If Escherichia coli is cultured in broth containing both glucose and lactose it A uses glucose preferentially until the

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