Question

In recombinant DNA technique the term vector refers to

• A. plasmids that can transfer foreign DNA into a living cell
• B. cosmids that can cut DNA at specific base sequence
• C. plasmids that can join difference DNA fragments
• D. cosmids that can degrade harmful proteins

Answer 1

The correct option is A plasmids that can transfer foreign DNA into a living cell

The DNA used as a carrier for transferring a fragment of foreign DNA into a suitable host is called vehicle DNA or cloning vector or gene carrier. When desired gene is introduced into a vector, recombinant DNA is formed. Vectors may be plasmids, a bacteriophage, cosmids, phagemids, yeast artificial chromosomes (YACs), Bacterial artificial chromosomes (BACs), etc. Plasmids are extra-chromosomal, self-replicating, usually circular, double stranded DNA molecules found naturally in many bacteria. These naturally occurring plasmids have been modified to serve as vectors in the laboratory.