Assertion : Restriction enzymes cut the strand of DNA to produce sticky ends.
Reason : Stickness of the ends facilitates the action of the enzyme DNA polymerase

Options

A. if both are true with reason being correct explanation
B. both true but reason is not correct explanation
C. assertion true but reason is wrong
D. both are wrong

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that restriction enzymes cut the DNA strand to produce sticky ends.
- Restriction enzymes are proteins that recognize specific sequences in DNA and cut the DNA at those sites.
- When they cut, they can leave overhanging ends, known as sticky ends, which are crucial for DNA recombination.

2. **Understanding the Reason:**
- The reason provided states that the stickiness of the ends facilitates the action of the enzyme DNA polymerase.
- DNA polymerase is an enzyme that synthesizes new DNA strands by adding nucleotides to a growing chain, but it does not utilize sticky ends for its action.

3. **Analyzing the Correctness of the Reason:**
- The assertion is true; restriction enzymes do produce sticky ends.
- However, the reason is incorrect because it incorrectly attributes the function of sticky ends to DNA polymerase instead of DNA ligase.
- DNA ligase is the enzyme that actually joins DNA fragments with sticky ends.

4. **Conclusion:**
- Therefore, the assertion is true, but the reason is false. The correct relationship is that sticky ends facilitate the action of DNA ligase, not DNA polymerase.

5. **Final Answer:**
- The answer is that the assertion is true, but the reason is false. This corresponds to option 3.

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