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Two DNA samples A and B have melting temperatures 305K and 320K respectively. Identify the correct statement based on this information.

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in Chemistry – Class 12 by (188k points)
Two DNA samples A and B have melting temperatures 305K and 320K respectively. Identify the correct statement based on this information.

(a) A and B are complementary strands

(b) B has more CG pairs than A

(c) A has more CG pairs than B

(d) A has more hydrogen bonds than B

This question was posed to me by my college professor while I was bunking the class.

Asked question is from Biomolecules topic in chapter Biomolecules of Chemistry – Class 12

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Right choice is (b) B has more CG pairs than A

The best explanation: CG bonds are made of triple hydrogen bonds and AT bonds are made of double hydrogen bonds. Since the melting temperature of B is higher than that of A, B should have more hydrogen bonds and as a result more CG pairs.

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