Given below are two statements:
Assertion (A): Hydrolysis of DNA does not form equal numbers of adenine (A) and thymine (T), or guanine (G) and cytosine (C).
Reason (R): In DNA, adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine.
The correct answer is:
Given below are two statements:
Assertion (A): Hydrolysis of DNA does not form equal numbers of adenine (A) and thymine (T), or guanine (G) and cytosine (C).
Reason (R): In DNA, adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanine.
The correct answer is:
Show Hint
2. Base pairing: A-T (2 H-bonds), G-C (3 H-bonds)
3. Hydrolysis breaks phosphodiester bonds, not base pairs
4. Equal amounts result from complementary strand pairing
- Both A and R are correct and R is the correct explanation of A
- Both A and R are correct but R is not the correct explanation of A
- A is correct but R is incorrect
- A is incorrect but R is correct
The Correct Option is D
Approach Solution - 1
- Evaluation of Reason (R): The statement about base pairing is accurate. Thus, R is correct.
- Relationship between A and R: R correctly describes base pairing but does not explain A. Thus, the correct choice is (4).
Approach Solution -2
Step 1: Analyze the Assertion (A).
The assertion states that hydrolysis of DNA does not yield equal numbers of adenine (A) and thymine (T), or guanine (G) and cytosine (C).
This is incorrect because Chargaff's rules state that in DNA, the amount of adenine equals thymine, and the amount of guanine equals cytosine.
Step 2: Analyze the Reason (R).
The reason states that adenine forms hydrogen bonds with thymine, and cytosine forms hydrogen bonds with guanine.
This is correct and explains the base pairing rules in DNA structure.
Step 3: Conclusion.
Therefore, Assertion (A) is incorrect, but Reason (R) is correct.
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