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a
Plasmids are widely used in gene transfer.
b
These are found in both bacteria and viruses.
c
Plasmids contain genes for vital activities.
d
They are an important part of the chromosome.
answer is A.
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Detailed Solution
Plasmids are extrachromosomal structures and they are widely used in gene transfer. There are present in bacteria and not seen in viruses. They confer some specific character to the bacteria but do not contain genes for vital activities.