Recall that two hydrogen bonds bind A and T,but three hydrogen bonds bind G and C.Because the stability of DNA is affected by the number of hydrogen bonds,with more bonds promoting more stability,which double-stranded DNA molecule would likely have the greatest stability?
A) A molecule with 20 percent A
B) A molecule with 26 percent G
C) A molecule with 32 percent C
D) A molecule with 38 percent T
E) More information is required to answer this question.

Question

Quizplus · Accepted Answer

A molecule with 32 percent C would have the greatest stability because C pairs with G, which has three hydrogen bonds, while A pairs with T, which has only two hydrogen bonds. Therefore, a higher percentage of C means a higher percentage of G, which results in a greater number of hydrogen bonds and increased stability.

Recall That Two Hydrogen Bonds Bind a and T,but Three