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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): EcoRI produces overhanging stretches called sticky ends on each strand of DNA. Reason (R): EcoRI cuts the DNA strand a little away from the centre of the palindrome sites, but between the same two bases on the opposite strands. In the light of the above statements, choose the correct answer from th

Options

  1. ABoth (A) and (R) are true and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C(A) is true but (R) is false
  4. D(A) is false but (R) is true

Correct answer

A. Both (A) and (R) are true and (R) is the correct explanation of (A)

Step-by-step solution

According to NCERT, restriction enzymes like EcoRI cut the strand of DNA a little away from the centre of the palindrome sites, but between the same two bases on the opposite strands. This specific cutting mechanism leaves single-stranded portions at the ends. These overhanging stretches are called sticky ends on each strand. Therefore, both Assertion (A) and Reason (R) are true, and Reason (R) correctly explains why the sticky ends are formed. Answer: Both (A) and (R) are true and (R) is the correct explanation of

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