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.

If both assertion and reason are true and reason is the correct explanation of assertion.

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If both assertion and reason are true but reason is not the correct explanation of assertion

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If assertion is true but reason is false

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If both assertion and reason are false

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Solution

The correct option is C If assertion is true but reason is false
In a DNA molecule, A-T rich parts melt (denature) before G-C rich parts because there are two H-bond between A and T whereas in between G and C, there are three H-bonds. The triple bond requires more energy to be broken as compared to double 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.

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.