A) bacteriophage
B) DNA molecule incorporated, in bacterial chromosome
C) DNA molecule present in mitochondria
D) extra chromosomal genetic element of bacteria
Correct Answer: D
Solution :
Term plasmid was given by Lederberg. Plasmid is an extra piece of DNA in bacteria which exist separately from main bacterial chromosome and are capable of self replicating. Plasmids have no protein coat and cannot exist outside a cell. Plasmids are used in gene recombinant technology.
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