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NEET2026BiologyChapterActual

Given below are two statements: Statement I: Exonucleases remove nucleotides from the ends of the DNA whereas endonucleases make cuts at specific positions within the DNA. Statement II: In the naming of the restriction enzyme EcoRI, the letter 'R' is derived from the name of the genus of the bacteria from which it was isolated. In the light of the above statements, choose the most appropriate answer from the options

Options

  1. ABoth Statement I and Statement II are incorrect
  2. BStatement I is correct but Statement II is incorrect
  3. CStatement I is incorrect but Statement II is correct
  4. DBoth Statement I and Statement II are correct

Correct answer

B. Statement I is correct but Statement II is incorrect

Step-by-step solution

Statement I is correct as exonucleases remove nucleotides from the ends of the DNA, whereas endonucleases make cuts at specific positions within the DNA. Statement II is incorrect because in the naming of the restriction enzyme EcoRI, the letter 'E' is derived from the genus Escherichia, 'co' from the species coli, 'R' from the name of the strain RY13, and 'I' indicates the order in which the enzyme was isolated from that strain of bacteria. Answer: Statement I is correct but Statement II is incorrect

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