Repressors
A) bind or do not bind to the operator depending on their shape (conformation) AND are involved in positive control.
B) bind or do not bind to the operator depending on their shape (conformation) AND are involved in negative control.
C) always bind to the promoter AND are involved in positive control.
D) always bind to the promoter AND are involved in negative control.
E) always bind to the ribosome AND are involved in negative control.

Question

Repressors
A) bind or do not bind to the operator depending on their shape (conformation) AND are involved in positive control.
B) bind or do not bind to the operator depending on their shape (conformation) AND are involved in negative control.
C) always bind to the promoter AND are involved in positive control.
D) always bind to the promoter AND are involved in negative control.
E) always bind to the ribosome AND are involved in negative control.

Quizplus · Accepted Answer

Repressors are proteins that bind to the operator region of DNA and prevent transcription of downstream genes. They can either bind or not bind to the operator depending on their conformation, thus regulating gene expression. They are involved in negative control because they inhibit transcription.