Home Biology Molecular Basis of Inheritance Skill Builder Arrange the following steps in the correct s…
Biology Molecular Basis of Inheritance Skill Builder Single Correct MCQ
Published on: August 21, 2026

Arrange the following steps in the correct sequence as they occur in the regulation of the lac operon when an inducer is present:

A
RNA polymerase binds to the promoter, initiating transcription.
,
B
Lactose on interaction with a repressor inactivates its binding to the operator.
, , , ,
C
The inducer (lactose or allolactose) binds to the repressor protein.
, , , ,
D
Lactose is transported into the cells through the action of permease.
Choose the correct sequence of events from the options given below: , , ,

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The correct answer is:
C

In the absence of a preferred carbon source such as glucose, if lactose is provided in the growth medium of the bacteria, the lactose is transported into the cells through the action of permease. In the presence of an inducer, such as lactose or allolactose, the repressor is inactivated by interaction with the inducer. This prevents binding of repressor protein to the operator region of the operon. This allows RNA polymerase access to the promoter and transcription proceeds.

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