The average energy of each hydrogen bond in A-T pair is x kcal mol–1

1.	The average energy of each hydrogen bond in A-T pair is x kcal mol–1 and that in G-C pair is y kcal mol–1. Assuming that no other interaction exists between the nucleotides, the approximate energy required in kcal mol–1 to split the following double stranded DNA into two single strands is [Each dashed line many represent more than one hydrogen bond between the base pairs] (A) 10x + 9y (B) 5x + 3y (C) 15x + 6y (D) 5x + 4.5y
Answer» Correct option (A) 10x + 9y Explanation: no. of hydrogen bond between A – T = 2 no. of hydrogen bond between a – c = 3 so total energy required = 10 x + 9y

The average energy of each hydrogen bond in A-T pair is x kcal mol–1 and that in G-C pair is y kcal mol–1. Assuming that no other interaction exists between the nucleotides, the approximate energy required in kcal mol–1 to split the following double stranded DNA into two single strands is [Each dashed line many represent more than one hydrogen bond between the base pairs] (A) 10x + 9y (B) 5x + 3y (C) 15x + 6y (D) 5x + 4.5y

Answer»

Correct option (A) 10x + 9y

Explanation:

no. of hydrogen bond between A – T = 2

no. of hydrogen bond between a – c = 3

so total energy required = 10 x + 9y

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