Which of the following accounts for the negative control of operons?
A) promoters
B) repressors
C) structural genes
D) operators
E) deactivators

Question

Which of the following accounts for the negative control of operons?
A) ​promoters
B) ​repressors
C) ​structural genes
D) ​operators
E) ​deactivators

Quizplus · Accepted Answer

Repressors are proteins that bind to operators and block RNA polymerase from binding to the promoter, thereby preventing transcription of the structural genes. This is the mechanism of negative control of operons. Promoters and operators are both involved in the regulation of transcription, but promoters are not involved in negative control. Structural genes are the genes encoding the proteins of the metabolic pathway, not the regulatory components. Deactivators are not a commonly recognized component of operon regulation.

Which of the Following Accounts for the Negative Control of Operons