Repressor proteins do not
A) prevent binding of RNA polymerase to DNA.
B) eliminates the need for lactose-metabolizing enzymes when lactose is not present.
C) inactivate operon genes when their products are not required.
D) bind to sets of operators.
E) increase transcription rates.

Question

Repressor proteins do not
A) ​prevent binding of RNA polymerase to DNA.
B) eliminates the need for lactose-metabolizing enzymes when lactose is not present.
C) ​inactivate operon genes when their products are not required.
D) ​bind to sets of operators.
E) ​increase transcription rates.

Quizplus · Accepted Answer

Repressor proteins are known to decrease or inhibit transcription rates rather than increase them. Therefore, statement E is the correct answer. Statements A, B, C, and D are all correct regarding the function of repressor proteins. They prevent RNA polymerase from binding to DNA, eliminate the need for lactose-metabolizing enzymes, inactivate genes when their products are not required, and bind to sets of operators.

Repressor Proteins Do Not