Assertion. DNA molecule acts as a template for synthesis of both RNA and DNA.
Reason. DNA duplex has the feature of right handed coiling and antiparallel.

Options

A. If both Assertion and Reason are true and the Reason is a correct explanation of the Assertion .
B. If both Assertion and Reason are true but Reason is not a correct explanations of the Assertion
C. If Assertion is true but the Reason is false .
D. If both Assertion and Reason are false.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Assertion:**
- The assertion states that "DNA molecule acts as a template for synthesis of both RNA and DNA." This is indeed correct. DNA serves as a template during two key processes: replication (for DNA synthesis) and transcription (for RNA synthesis).

2. **Explaining DNA as a Template:**
- During DNA replication, one strand of the DNA molecule serves as a template for synthesizing a new complementary strand. This process is semi-conservative, meaning that each new DNA molecule consists of one original strand and one newly synthesized strand.
- In transcription, the DNA serves as a template to synthesize messenger RNA (mRNA). The enzyme RNA polymerase reads the DNA sequence and synthesizes a complementary RNA strand.

3. **Understanding the Reason:**
- The reason states that "DNA duplex has the feature of right-handed coiling and antiparallel." This is also true. DNA is structured as a double helix that coils in a right-handed manner, and the two strands of the helix run in opposite directions (antiparallel).

4. **Analyzing the Relationship:**
- While both the assertion and the reason are true, the reason does not directly explain why DNA acts as a template for RNA and DNA synthesis. The assertion focuses on the functional role of DNA in synthesis, while the reason describes structural characteristics of DNA.

5. **Conclusion:**
- Therefore, the correct answer to the question is that both the assertion and the reason are true, but the reason is not a correct explanation of the assertion.

**Final Answer:**
Both assertion and reason are true, but the reason is not a correct explanation of the assertion.

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