Question

Circular plasmids are typically found in which form inside a bacterial cell?

1. Covalently closed circular
2. Open circular
3. Linear
4. Negatively supercoiled
5. More than one but not all of the above

Answer 1

E.  More than one but not all of the above

The plasmids are small circular DNA which are double stranded and are found within the cells of bacteria or eukaryotic organisms. They are parted from the chromosomal DNA and will replicate independently. They are sometimes lost from the bacterial cell or some are transferred into cell by the process of conjugation. The plasmids provide the antibiotic resistance to bacteria. The plasmids exist in three forms such as covalently closed DNA, linear and open- circular.