In DNA the complementary bases are

uracil and adenine : cytosine and guanine

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adenine and thymine : guanine and cytosine

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adenine and thymine : guanine and uracil

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adenine and guanine : thymine and cytosine

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Solution

The correct option is B adenine and thymine : guanine and cytosine
In DNA the complementary bases are adenine and thymine : guanine and cytosine. It means adenine always pairs with thymine by double bond and guanine always pairs with cytosine with triple bond.

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Similar questions

Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

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