In DNA the complementary bases are

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Adenine and guanine; thymine and cytosine

Adenine and thymine; guanine and uracil

Uracil and adenine; cytosine and guanine

Adenine and thymine; guanine and cytosine

answer is C.

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Detailed Solution

Each nucleotide in DNA is made up of nitrogen-containing base guanine (G), adenine (A), thymine (T), or cytosine (C), a monosaccharide sugar termed deoxyribose and a phosphate group. Covalent bonds between the sugar of one nucleotide and the phosphate of the next nucleotide form a chain that results in an alternating sugar-phosphate backbone. Hydrogen bonds join the nitrogenous bases of the two distinct polynucleotide strands to form double-stranded DNA according to base-pairing regulations (A with T and C with G).

Hence, the correct answer is option C) Adenine and guanine; thymine and cytosine.

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