Question

By which bonds the purine and pyrimidine pairs of Complementary Strands of DNA held together?

Options

• N - bonds

• O - bonds

• H - bonds

• C - bonds

Answer 1

H - bonds

Explanation:-

Three hydrogen bonds form between guanine and cytosine. Two hydrogen bonds form between adenine and thymine or adenine and uracil. Complementary pairs always involve one purine and one pyrimidine base.