Question

Circular DNA molecule is present in

• A. Viruses
• B. Bacteria only
• C. Bacteria and Chloroplasts only
• D. Bacteria, Chloroplasts and Mitochondria

Answer 1

The correct option is D Bacteria, Chloroplasts and Mitochondria

Bacteria is a prokaryotic organism. It has single, circular DNA. The bacterial genome leads ranges from 130 kbp to 14 Mbp. The genetic material is in direct contact with the cytoplasm. The region of the cytoplasm where the genetic material is present is known as a nucleoid. The circular DNA undergoes transcription and translation and synthesizes bacterial proteins.

The chloroplast is a semi-autonomous organelle which has circular DNA. It is known as Ct-DNA which helps to synthesize the protein for the organelle. ct-DNA acts as plasmid and it is used for genetic manipulation.

Mitochondria is a semi-autonomous organelle which can synthesize its own protein. It has circular DNA which is known as mt-DNA. mt-DNA acts as plasmid and it is used for genetic manipulation.

So, the correct answer is option D.