One of the key factors, which makes the plasmid the vector in genetic engineering is\

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Professor PC Thomas Classes · Answer

(b) : Plasmids are extra-chromosomal, self replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeasts. The plasmid that is used as carrier for transferring a fragment of foreign DNA into a suitable host is called vehicle DNA or cloning vector or gene carrier.