It Is Possible for a Repressor to Negatively Regulate the Expression

question 83

Multiple Choice

It is possible for a repressor to negatively regulate the expression of an operon because:

• A)the repressor induces the expression of the inducer by binding to the promoter that comes before the inducer gene.
• B)one of the structural genes expressed in the operon negatively regulates the repressor.
• C)the repressor-binding site overlaps the promoter site of the operon, allowing it to physically block the binding of RNA polymerase.
• D)the repressor-binding site on the DNA overlaps with the translation start site, hence preventing the transcription.
• E)the repressor physically blocks where the activator should be binding on the operator region.

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