The average energy of each hydrogen bond in \( \mathrm{A}-\mathrm{T} \) pair is \( \mathrm{x} \)...

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The average energy of each hydrogen bond in \( \mathrm{A}-\mathrm{T} \) pair is \( \mathrm{x} \) \( \mathrm{kcal} \mathrm{mol}^{-1} \) and that in \( \mathrm{G}-\mathrm{C} \) pair is \( \mathrm{y} \mathrm{kcal} \mathrm{mol}^{-1} \). Assuming that no other interaction exists between the nucleotides, following double stranded DNA into two single strands is
[Each dashed line may represent more than one hydrogen bond between the base pairs]
(a) \( 10 \mathrm{x}+9 \mathrm{y} \)
(b) \( 5 \mathrm{x}+3 \mathrm{y} \)
(c) \( 15 x+6 y \)
(d) \( 5 \mathrm{x}+4.5 \mathrm{y} \)
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