First slide

Regulation of Gene Expression

Question

The lac operator is present only in lac operon and it interacts specifically with _______.
A. lac repressor
B. Val operon
C. Trp repressor
D. lac inducer
E. Co-repressor inducer complex
Choose the correct fill in the blank given above.

Easy

A

lac repressor and Val operon
B

lac repressor, lac inducer and co-repressor inducer complex
C

lac repressor
D

lac repressor, Val operon and Trp repressor

Solution

The operator region is adjacent to the promoter elements in most operons and in most cases the sequences of the operator bind a repressor protein. Each operon has its specific operator and specific repressor.

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