Question
Biology Question on recombinant technology
Plasmids are suitable vectors for gene cloning because
A
these are small circular DNA molecules which can integrate with host chromosomal DNA
B
these are small circular DNA molecules with their own replication origin site
C
these can shuttle between prokaryotic and eukaryotic cells
D
these often carry antibiotic resistance genes
Answer
these are small circular DNA molecules with their own replication origin site
Explanation
Solution
Plasmids replicate autonomously. These carry a signal situated at their replication origin which determines how many copies are to be made and this number can be artificially increased for cloning of given gene.