Question

Two samples of DNA, A and B have melting points $340K$ and $350K$ respectively. This is because

• A. B has more GC content than A
• B. A has more GC content than B
• C. B has more AT cotent than A
• D. both have same AT content

Answer 1

The correct option is A B has more GC content than A

The B sample of DNA having higher melting point must be having more GC content as comppared to sample A. Since GC base pair having 3 hydrogen bonds as compare to AT base pair having only 2 hydrogen bonds, results in stronger bonding.

So, option $A$ is correct