An Operon Is Controlled by a Repressor

question 21

Multiple Choice

An operon is controlled by a repressor. When the repressor binds to a small molecule, it binds to DNA near the operon. The operon is constitutively expressed if a mutation prevents the repressor from binding to the small molecule. The type of control illustrated is:

• A) negative inducible.
• B) negative repressible.
• C) positive inducible.
• D) positive repressible.
• E) catabolite repression.

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