In regulation of the lac operon, when lactose is present and glucose is absent, a. there is a low level of cAMP present. b. there is a high level of cAMP present. c. transcription of structural genes occurs. d. transcription of lactose occurs. e. Both b and c are correct.
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Transcription of the lac operon is maximal when: a) lactose is absent and glucose is present. b) lactose is absent and glucose is absent. c) lactose is present and glucose is present. d) lactose is present and glucose is absent.
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The lac operon consists of regulatory regions such as the promoter as well as the structural genes lacZ, lacY, and lacA, which code for proteins involved in lactose metabolism. What would be the outcome of a mutation in one of the structural genes of the lac operon? a. Mutation in structural genes will stop transcription. b. Mutated lacY will produce an abnormal $\beta$ galactosidase protein. c. Mutated lacA will produce a protein that will transfer an acetyl group to $\beta$ galactosidase. d. Transcription will continue but lactose will not be metabolized properly.
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