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Which one of the following is an incorrect combination?
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Adenine, thymine, cytidine
Adenine (A), guanine (G), cytosine (C), thymine $(T)$ and uracil $(U)$ are all nitrogenous bases, whereas cytidine is a nucleoside i.e., a combination of a nitrogenous base (cytosine) with a pentose sugar (ribose).
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