Which of the following is not a feature of the plasmids?
Answer: (D) Single – stranded. Answer: (D) Single – stranded Solution: Plasmids are small, circular, double-stranded extra-chromosomal DNA molecules that float in the bacterial cytoplasm.
- A.Independent replication
- B.Circular structure
- C.Transferable
- D.Single – stranded✓
Correct Answer
(D) Single – stranded
Solution & Explanation
Answer: (D) Single – stranded Solution: Plasmids are small, circular, double-stranded extra-chromosomal DNA molecules that float in the bacterial cytoplasm. They replicate independently of the chromosomal DNA (independent replication), are circular in structure, and can be transferred between cells, which is why they serve as cloning vectors. They are NOT single-stranded (DNA in plasmids is double-stranded), so option (D) is the feature that does not apply. NCERT Reference: Ch 9, p.164, line(s) 42 — "autonomously replicating circular extra-chromosomal DNA"