Biology Biotechnology Principles and Processes All Topic Question For Revision Test Single Correct MCQ
Published on: August 12, 2026

A bacterium modifies its DNA by adding methyl groups to the DNA, It does so to :-

A
Clone its DNA
B
Be able to transcribe many genes simultaneously
C
Turn its gene on
D
Protect its DNA from its own restriction enzyme

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Verified by Experts
The correct answer is:
D

Bacteria add methyl groups to specific DNA sequences to protect their own DNA from being cut by their restriction endonucleases. The restriction enzymes destroy foreign DNA (such as bacteriophage DNA), while the methylated bacterial DNA remains safe.

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