NEET 2024 · BiologyPrevious Year Question
Which of the following statements is correct regarding the process of replication in E.coli ?
Answer: (C) The DNA dependent DNA polymerase catalyses polymerization in 5′ → 3′ direction.. Answer: (C) The DNA dependent DNA polymerase catalyses polymerization in 5' -> 3' direction.
- A.The DNA dependent RNA polymerase catalyses polymerization in one direction, that is 5′ → 3′.
- B.The DNA dependent DNA polymerase catalyses polymerization in 5′ → 3′ as well as 3′ → 5′ direction.
- C.The DNA dependent DNA polymerase catalyses polymerization in 5′ → 3′ direction.✓
- D.The DNA dependent DNA polymerase catalyses polymerization in one direction that is 3′ → 5′.
Correct Answer
(C) The DNA dependent DNA polymerase catalyses polymerization in 5′ → 3′ direction.
Solution & Explanation
Answer: (C) The DNA dependent DNA polymerase catalyses polymerization in 5' -> 3' direction. DNA-dependent DNA polymerases catalyse polymerisation only in one direction, 5' -> 3'; this single-direction constraint is why one strand is synthesised continuously and the other discontinuously. NCERT Ch 5, p.90, lines 034-035: "The DNA-dependent DNA polymerases catalyse polymerisation only in one direction, that is 5'->3'."
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