The Trp Operon in E

Multiple Choice

The trp operon in E. coli is regulated in such a manner as to allow expression of the genes only when cellular levels of tryptophan are low. When tryptophan levels are adequate, the secondary structure of the mRNA halts translation. This form of regulation is known as

A) negative regulatory control.
B) repression.
C) attenuation.
D) positive regulatory control.
E) transcriptional regulation.