Which one of the following combinations is found in DNA ?

Guanine and guanidine

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Guanidine and cytosine

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Guanine and cytosine

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Adenine and guanidine

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Solution

The correct option is C Guanine and cytosine
The DNA is composed of the purines and pyrimidines, adenine, guanine, thymine and cytosine. The adenine binds to the thymine and the guanine binds to cytosine. The hydrogen bonding takes place between these bases and so the complementary strands can hold each other in the DNA helix.
Thus, the correct answer is option C.

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