Question:
Assertion (A): The two strands of DNA are complementary to each other.
Reason (R): The hydrogen bonds are formed between specific pairs of bases.
Assertion (A): The two strands of DNA are complementary to each other.
Reason (R): The hydrogen bonds are formed between specific pairs of bases.
Reason (R): The hydrogen bonds are formed between specific pairs of bases.
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In DNA, hydrogen bonds form only between specific base pairs: adenine pairs with thymine and guanine pairs with cytosine, so the Reason is true.
Updated On: Jun 16, 2026
- Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- Assertion (A) is true, but Reason (R) is false.
- Assertion (A) is false, but Reason (R) is true.
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The Correct Option is A
Solution and Explanation
Concept: In DNA, hydrogen bonds form only between specific base pairs: adenine pairs with thymine and guanine pairs with cytosine, so the Reason is true. Because each base can only hydrogen bond with its specific partner, the sequence of one strand fixes the sequence of the other, making the two strands complementary, so the Assertion is true. The specific base pairing through hydrogen bonds is exactly what makes the strands complementary, so the Reason correctly explains the Assertion.
Answer: Option (A) - both A and R are true and R is the correct explanation of A, since specific hydrogen bonded base pairing (A-T, G-C) is what makes the two strands complementary.
Answer: Option (A) - both A and R are true and R is the correct explanation of A, since specific hydrogen bonded base pairing (A-T, G-C) is what makes the two strands complementary.
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