Question

Given below are two statements: I. Cytosine and guanine are formed in equal quantities in DNA hydrolysis.
II. Adenine and uracil are formed in equal quantities in RNA hydrolysis. The correct answer is:

• A. Statements I, II both are correct
• B. Statements I, II both are incorrect
• C. Statement I is correct but statement II is incorrect
• D. Statement I is incorrect but statement II is correct

Hint:

In DNA, cytosine and guanine are always found in equal quantities due to complementary base pairing, but this does not apply to adenine and uracil in RNA.

Answer 1

The Correct Option is C

Step 1: Understanding DNA Base Pairing
- DNA follows Chargaff’s rule, which states that the number of cytosine (C) equals the number of guanine (G), and the number of adenine (A) equals the number of thymine (T).
- Hence, in DNA hydrolysis, cytosine and guanine are produced in equal quantities. Step 2: RNA Hydrolysis and Base Pairing
- RNA consists of adenine (A), uracil (U), cytosine (C), and guanine (G).
- Unlike DNA, RNA does not follow Chargaff’s rule because it is single-stranded.
- Adenine and uracil are not necessarily in equal amounts in RNA hydrolysis.
Thus, statement I is correct, but statement II is incorrect.