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How does an exonuclease act on DNA?

Answer and explanation

Correct answer: Removes nucleotides from the free ends of DNA

An exonuclease removes nucleotides sequentially from the free 5′ or 3′ ends of a DNA polynucleotide chain. In contrast, an endonuclease cuts within the DNA molecule, so option B is incorrect. Exam tip: remember “exo” as acting from the outside or end.

Related tags

ExonucleaseNucleaseGenetic EngineeringDna EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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