Explain how the complementary strands of DNA are held together
A) They are held by ionic bonds.
B) They are held by complementary base pairing; adenine to thymine and guanine to cytosine.
C) They are held by complementary base pairing; adenine to cytosine and thymine to guanine.
D) They are held by complementary base pairing; adenine to guanine and thymine to cytosine.
E) They are held by complementary base pairing; adenine to adenine, thymine to thymine, guanine to guanine, and cytosine to cytosine.
Answer: B
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