An Enzyme Functions in a Biosynthetic Pathway in Bacteria

An enzyme functions in a biosynthetic pathway in bacteria.You predict that the product of the reaction may regulate the levels of the protein by

A) binding an aptamer in the RNA leader sequence that alters the conformation to block the ribosome binding site.
B) binding an aptamer in the RNA leader sequence that alters the conformation to expose the ribosome binding site.
C) binding the promoter region to prevent transcription.
D) binding an aptamer in the RNA leader sequence that causes an antiterminator to form.