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Which of the following is NOT an endonuclease?

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Which of the following is NOT an endonuclease?

(a) Mung bean nuclease

(b) S1 nuclease

(c) Terminal deoxynucleotidal transferase

(d) RNase A

The question was posed to me during an interview.

Question is from Enzymes for DNA Manipulation topic in portion Recombinant DNA Technology of Life Sciences

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Right answer is (c) Terminal deoxynucleotidal transferase

For explanation: Endonuclease are those which break internal phosphodiester bonds of DNA while exonuclease removes nucleotide from the end of the DNA. Examples: mung bean nuclease, S1 nuclease, Rnase A, and RNase H.

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