Which term refers to circular DNA found in bacteria?

Which term refers to circular DNA found in bacteria?

• A. Plasmid
• B. Chromosome
• C. Genome
• D. Nucleoid

Answer: (A)

Plasmids are small, circular DNA molecules that exist outside the bacterial chromosome and replicate independently. They often carry accessory genes, such as those for antibiotic resistance, and can be transferred between bacteria, which is why they’re distinct from the main genetic material. The bacterial chromosome itself is a larger circular DNA molecule that contains essential genes, and the nucleoid is the region of the cell where this chromosome is located. The genome refers to the entire genetic content of the organism, including the chromosome and any plasmids, but the term plasmid specifically denotes those extra-circular DNA pieces.

Plasmids are small, circular DNA molecules that exist outside the bacterial chromosome and replicate independently. They often carry accessory genes, such as those for antibiotic resistance, and can be transferred between bacteria, which is why they’re distinct from the main genetic material. The bacterial chromosome itself is a larger circular DNA molecule that contains essential genes, and the nucleoid is the region of the cell where this chromosome is located. The genome refers to the entire genetic content of the organism, including the chromosome and any plasmids, but the term plasmid specifically denotes those extra-circular DNA pieces.