12th Class Biology Principals And Processes Of Biotechnology

  • question_answer 14)   An enzyme catalyzing the removal of nucleotides from the ends of DNA is (a) endonuclease             (b) exonuclease                               (c) DNA ligase                                    (d) Hind II

    Answer:

                      (b) Restriction enzymes belongs to a class of enzymes called nucleases and are of two types (i) Exo nucleases remove nucleotides from the ends of the DNA. (ii) Endo nucleases make cuts at specific positions within the DNA. DNA ligase is a sealing enzymes (also called as genetic gum), which is responsible for joining of two individual fragments of DNA, whereas Hind II is first discovered restriction endonuclease enzyme.

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