Which one of the following remove nucleotides from the ends of DNA or RNA?
Correct answer: B. Exonuclease
- A. Endonuclease
- B. Exonuclease
- C. S 1 nuclease
- D. Deoxyribonuclease
Explanation
Exonucleases remove nucleotides one at a time from the free ends of DNA or RNA strands. An endonuclease cuts within a nucleic-acid strand, so students who confuse end cutting with internal cutting may choose a.
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About Mode of Enzyme Action
Enzyme action depends on the active site forming a temporary enzyme substrate complex, then converting substrate into products with lower activation energy. The lock and key and induced fit models explain specificity and binding, while cofactors and changes in enzyme shape can affect catalysis.
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