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प्रश्न
Which nitrogenous bases are classified as pyrimidines, characterized by their single-ringed structure?
पर्याय
Adenine and Thymine
Guanine and Cytosine
Cytosine and Thymine
Adenine and Guanine
MCQ
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उत्तर
Pyrimidines are nitrogenous bases with a single-ringed structure. The two pyrimidines in DNA are cytosine (C) and thymine (T). They pair with purines (adenine and guanine, which have double-ringed structures) to maintain uniform helix diameter. This complementary pairing of purine-pyrimidine combinations ensures consistent spacing in the DNA double helix.
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