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Q.

How does a bacterial cell protect its own DNA from restriction enzymes ?

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a

By adding methyl groups to adenines and cytosines 

b

By adding histones to DNA

c

By forming new phosphodiester bonds

d

By forming closed DNA

answer is A.

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Detailed Solution

Bacterial cell protects its own DNA from restriction endonucleases by methylating adenine and cytosine of bacterial DNA by methyl transferase.

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