In a particular E. coli strain, a mutation in the thiMD operon results in improper formation of the stem loop secondary structure making it impossible to bind TPP. There are two enzymes encoded by the thiMD operon. How many of the enzymes encoded in the thiMD operon are translated?
A) two
B) zero
C) three
D) one

Question

Quizplus · Accepted Answer

The thiMD operon in E. coli is regulated by TPP (thiamine pyrophosphate) availability. When TPP is not bound, transcription of the operon proceeds, allowing both enzymes encoded by the operon to be translated. The mutation affecting stem loop formation prevents TPP binding, thus, transcription and subsequent translation of both enzymes occur.

In a Particular E