lac operon: synthesizes proteins for the metabolism of lactose (lac genes)
• when lactose and glucose are present, lac genes are not expressed
• when only lactose is present, lac genes are expressed
In the lac operon, what are the likely effects on operon gene transcription of the mutations identified below?
Mutation of consensus sequence in the lac promoter
Mutation of the repressor binding site on the operator sequence
Mutation of the lac I gene affecting the allosteric site of the protein
Mutation of the CAP binding site of the lac promoter
Mutation of the lac I gene affecting the DNA-binding site of the protein
A. Transcription is blocked.
B. Transcription is constitutive.
C. No effect on transcription
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