A regulatory protein binds to the operator in a strand of DNA, blocking transcription. The protein is
A) a repressor.
B) an inducer.
C) an operon.
D) a terminator.
E) an activator.

Question

Quizplus · Accepted Answer

A regulatory protein that binds to the operator and blocks transcription is a repressor. Inducers bind to repressors and cause them to release the operator, allowing transcription to occur. An operon is a group of genes and the regulatory elements that control them. A terminator is a sequence of DNA that signals the end of transcription. An activator is a regulatory protein that binds to DNA and enhances transcription.

A Regulatory Protein Binds to the Operator in a Strand