A) fragment of DNA which acts as vector
B) a fragement which joins two genes
C) m-RNA which acts as carrier
D) autotrophic fragment
Correct Answer: A
Solution :
[a] 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, capable of replicating independently of it. These often act as vehicles for gene transfer.
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