(a) fragment of DNA which acts as vector
(b) fragment which joins two genes
(c) mRNA which acts as carrier
(d) autotrophic fragment
[CBSE AIPMT 2000, 01]
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Correct Option (a) Reason : A plasmid is a piece of DNA, mostly in bacteria (but also in yeast) not forming a part of normal chromosomal DNA of a cell, but capable of replicating independently of it. These often act as vehicles for gene transfer.