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Read the following five statements (A-E) regarding enzymes used in recombinant DNA technology: (A) Restriction endonucleases function by inspecting the length of a DNA sequence. (B) They bind to the DNA and cut only one of the two strands at specific points. (C) Exonucleases remove nucleotides from the ends of the DNA. (D) Restriction enzymes belong to a larger class of enzymes called ligases. (E) They cut the sugar-

Options

  1. AThree
  2. BTwo
  3. CFour
  4. DFive

Correct answer

A. Three

Step-by-step solution

Statement (A) is correct as restriction endonucleases function by inspecting the length of a DNA sequence to find their specific recognition site. Statement (B) is incorrect because restriction endonucleases cut both strands of the DNA double helix at specific points in their sugar-phosphate backbones, not just one. Statement (C) is correct as exonucleases remove nucleotides from the ends of the DNA. Statement (D) is incorrect because restriction enzymes belong to a larger class of enzymes called nucleases, not lig

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