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NEET 2020 · BiologyPrevious Year Question

Choose the correct pair from the following:

Answer: (C) Ligases - Join the two DNA molecules. Answer: (C) Ligases - Join the two DNA molecules Solution: (answer_source external; NCERT-correct answer derived below.) DNA ligase acts on cut DNA molecules and joins their ends, so the Ligases pairing is correct.

  1. A.Nuclease - Separate the two strange of DNA
  2. B.Exonuclease - Make cuts at specific positions within DNA
  3. C.Ligases - Join the two DNA molecules✓
  4. D.Polymerases - Break the DNA into fragments

Correct Answer

(C) Ligases - Join the two DNA molecules

Solution & Explanation

Answer: (C) Ligases - Join the two DNA molecules Solution: (answer_source external; NCERT-correct answer derived below.) DNA ligase acts on cut DNA molecules and joins their ends, so the Ligases pairing is correct. The other pairs are wrong: nucleases (exo/endo) cut DNA rather than separating strands; exonucleases remove nucleotides from the ends (it is endonucleases that cut at specific internal positions); and polymerases synthesise/extend DNA rather than breaking it. NCERT Reference: Ch 9, p.165, line(s) 9-10 — "which acts on cut DNA molecules and joins their ends."

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