Assertion : In a DNA molecule,A-T rich parts | vedclass

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(C) In a $DNA$ molecule,the nitrogenous bases are held together by hydrogen bonds. $A$ (Adenine) pairs with $T$ (Thymine) via two hydrogen bonds,while

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If the Assertion is correct but Reason is incorrect.

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(C) In a $DNA$ molecule,the nitrogenous bases are held together by hydrogen bonds. $A$ (Adenine) pairs with $T$ (Thymine) via two hydrogen bonds,while $G$ (Guanine) pairs with $C$ (Cytosine) via three hydrogen bonds. Because $G-C$ pairs have three hydrogen bonds,they are more stable and require more energy to break compared to $A-T$ pairs,which have only two hydrogen bonds. Therefore,$A-T$ rich regions melt at lower temperatures than $G-C$ rich regions. The Assertion is correct,but the Reason is incorrect because it states the number of hydrogen bonds in reverse.

Assertion : In a $DNA$ molecule,$A-T$ rich parts melt before $G-C$ rich parts.
Reason : In between $A$ and $T$ there are three $H-$ bonds,whereas in between $G$ and $C$ there are two $H-$ bonds.

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Assertion : In a $DNA$ molecule,$A-T$ rich parts melt before $G-C$ rich parts.Reason : In between $A$ and $T$ there are three $H-$ bonds,whereas in between $G$ and $C$ there are two $H-$ bonds.