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What are exonucleases?

Options

  1. AEnzymes that make cuts at specific positions within the DNA
  2. BEnzymes that remove nucleotides from the ends of the DNA
  3. CEnzymes that join DNA fragments together
  4. DNone of the above

Correct answer

B. Enzymes that remove nucleotides from the ends of the DNA

Step-by-step solution

Restriction enzymes belong to a larger class of enzymes called nucleases. These are of two kinds; exonucleases and endonucleases . Exonucleases remove nucleotides from the ends of the DNA whereas, endonucleases make cuts at specific positions within the DNA. >Each restriction endonuclease functions by ‘inspecting’ the length of a DNA sequence. Once it finds its specific recognition sequence, it will bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar -phosphate back

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