A forensic scientist isolates a small DNA fragment containing exactly 10 Adenine-Thymine () base pai — Biomolecules Chemistry Question
Question
A forensic scientist isolates a small DNA fragment containing exactly 10 Adenine-Thymine ($A-T$) base pairs and exactly 10 Guanine-Cytosine ($G-C$) base pairs. What is the total number of hydrogen bonds stabilizing this specific fragment?
Answer: B
💡 Solution & Explanation
Every $A-T$ base pair is held together by exactly 2 hydrogen bonds, while every $G-C$ pair uses 3 hydrogen bonds. Total hydrogen bonds = $(10 \times 2) + (10 \times 3) = 20 + 30 = 50$.
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