Question

Assertion (A): Uracil base is present in DNA. Reason (R): DNA undergoes self-replication.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

In DNA, thymine pairs with adenine, while in RNA, uracil replaces thymine and pairs with adenine.

Answer 1

The Correct Option is D

- Uracil is not present in DNA; instead, thymine (T) is present. Uracil is found in RNA, not DNA. - However, DNA does undergo self-replication via semi-conservative replication, making the reason true. - Since Assertion (A) is false but Reason (R) is true, option (D) is correct.