The Trp Operon in E

question 38

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

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