Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): GC rich dsDNA has higher melting point than the AT rich dsDNA
Reason (R): Hydrogen bonding energy of a guanine-cytosine (GC) pair is higher than a adenine-thymine (AT) pair
In light of the above statements, choose the correct answer from the options given below.

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

Hint:

G-C base pairs share three hydrogen bonds, while A-T pairs share only two.
This additional hydrogen bond increases the total bonding energy of G-C pairs, resulting in a higher melting point for GC-rich DNA.

Answer 1

The Correct Option is A