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NEET2026BiologyChapterActual

Read the following statements regarding the enzymes used in recombinant DNA technology and identify the incorrect statements. A. Exonucleases make cuts at specific positions within the DNA. B. A restriction endonuclease inspects the length of a DNA sequence to find its specific recognition sequence. C. EcoRI cuts the DNA between bases G and A only when the sequence GAATTC is present in the DNA. D. DNA ligase joins th

Options

  1. AB, C and E only
  2. BA, D and E only
  3. CA and D only
  4. DC and D only

Correct answer

C. A and D only

Step-by-step solution

Statement A is incorrect because exonucleases remove nucleotides from the ends of the DNA, whereas endonucleases make cuts at specific positions within the DNA. Statement B is correct as each restriction endonuclease functions by inspecting the length of a DNA sequence to find its specific recognition sequence. Statement C is correct because EcoRI specifically recognizes the palindromic sequence GAATTC and cuts the DNA between the bases G and A. Statement D is incorrect because DNA ligase joins two DNA molecules by

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