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An enzyme catalysing the removal of nucleotides from ends of DNA is:

1. Protease
2. DNA ligase
3. Endonuclease
4. Exonuclease

Correct answer: Exonuclease

Solution

Exonucleases remove nucleotides one at a time from the ends of DNA strands. Endonucleases cut internal phosphodiester bonds, while ligase joins DNA fragments and proteases act on proteins.

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