In a double-helix DNA strand, the adenine on one strand forms a hydrogen bond with a(n) ________ on the other strand.
A) adenine
B) guanine
C) thymine
D) cytosine

Question

Quizplus · Accepted Answer

Adenine always pairs with thymine, and guanine always pairs with cytosine in a double-helix DNA strand. This is known as complementary base pairing. Therefore, the adenine on one strand forms a hydrogen bond with the thymine on the other strand.

In a Double-Helix DNA Strand, the Adenine on One Strand