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In DNA, the complementary bases are:

Option: 1
Adenine and thymine; guanine and cytosine

Option: 2
Uracil and adenine; cytosine and guanine

Option: 3
Adenine and thymine; guanine and uracil

Option: 4
Adenine and guanine; thymine and cytosine.

Answers (1)

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DNA comprises a sugar-phosphate backbone and the nucleotide bases which are guanine, cytosine, adenine and thymine.
In DNA the complementary bases are adenine and thymine, guanine and cytosine.
Cytosine forms three hydrogen bonds with guanine, and adenine forms two hydrogen bonds with thymine.
Adenine=Thymine, Guanine≡Cytosine.

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Pankaj Sanodiya

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