First slide

Regulation of Gene Expression

Question

In lac operon, choose the genes that are not transcribed.
a. lac promoter
b. lac operator
c. lac i
d. lac a

Easy

A

c and d
B

a and b
C

a, b and c
D

b, c and d

Solution

In lac operon lac i has information for the formation of repressor protein and lac a has information for the formation of enzyme transacetylase which is a protein. These two regions are transcribed. Lac promoter and lac operator are involved in regulation of transcription of structural genes but not transcribed.

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