A plasmid is
- A
A single-stranded RNA molecule, often used as a vector to deliver genes into eukaryotic cells
- B
A protein-DNA complex, often used as a delivery system to insert genes into bacterial hosts
- Ccheck_circle
A small circular DNA molecule, often used as a cloning vector to introduce DNA into bacteria
- D
A linear chromosome fragment, often used as a vector to introduce DNA into mammalian cells
Explanation
Plasmids replicate independently of the bacterial chromosome and often carry useful genes (antibiotic resistance markers).