B. Indicate whether transcription will occur or not under the following conditio

Question

B. Indicate whether transcription will occur or not under the following conditions. Answering “yes” or “no” is sufficient. Assume the statement is a complete description of the circumstance described- and that all nucleotides, enzymes, etc. required for transcription are available.

___________________ RNA polymerase is bound to the promoter

____________________ the repressor is bound to the operator, RNA polymerase is bound to the promoter

____________________ this is a lactose operon, which is inducible. Lactose binds to the repressor, RNA polymerase can bind to the promoter

____________________ this is a tryptophan operon, which is repressible. Tryptophan binds to the repressor, RNA polymerase can bind to the promoter

____________________ a mutation has occurred so that the repressor cannot bind to the operator. All other parts of the operon function normally.

Explanation / Answer

RNA polymerase is bound to the promoter: Yes The repressor is bound to the operator, RNA polymerase is bound to the promoter: No This is a lactose operon, which is inducible. Lactose binds to the repressor, RNA polymerase can bind to the promoter: Yes This is a tryptophan operon, which is repressible. Tryptophan binds to the repressor, RNA polymerase can bind to the promoter: No A mutation has occurred so that the repressor cannot bind to the operator. All other parts of the operon function normally: Yes

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