DNA with a higher G + C content is more stable at high temperatures than DNA with a high A + T content. Why?
A) G and C fit together better than A and T.
B) The two chains assume a parallel orientation when the A + T content is higher.
C) The negative charge on the phosphates in the backbone is partially neutralized in DNA with a higher G + C content.
D) The hydrophobic interactions between G and C are stronger than those between A and T.
E) G and C form three hydrogen bonds and A and T, just two.

Question

Quizplus · Accepted Answer

G and C form three hydrogen bonds while A and T form only two. This means that DNA with a higher G + C content will have more hydrogen bonds overall, resulting in stronger stability and resistance to denaturation at high temperatures.

DNA with a Higher G + C Content Is More