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What are exonucleases?

Options

  1. AEnzymes that remove nucleotides from the ends of the DNA
  2. BEnzymes that make cuts at specific positions within the DNA
  3. CEnzymes that inspect the length of a DNA sequence
  4. DEnzymes that bind to the DNA and cut each of the two strands of the double helix

Correct answer

A. 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 backb

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