Question

Plasmids are extra chromosomal circular DNA molecules

• A. which have their own point of replication and can replicate independently
• B. which have their own point of replicant but cannot replicate independently
• C. which do not have their own point of replication and cannot replicate independent of bacterial chromosomal DNA
• D. none of the above

Answer 1

The correct option is A which have their own point of replication and can replicate independently

Plasmids are extra chromosomal genetic element found in many bacteria. Plasmids are closed circles of double stranded DNA that can exists and replicate independently of the chromosome. Plasmids provide genetic instruction for certain cell activities (e.g. resistance of antibiotic drugs). Plasmids are widely used as vectors to produce recombinant DNA for gene cloning.