Extrachromosomal DNA used as vector in gene cloning is

Transposon

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Intron

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Exon

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Plasmid

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Solution

The correct option is D Plasmid
The most commonly used cloning vectors are E.coli plasmids, small circular DNA molecules that include three functional regions:
(1) an origin of replication,
(2) a drug-resistance gene, and
(3) a region where DNA can be inserted without interfering with plasmid replication or expression of the drug-resistance genes.
So, option D is the correct option.

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