Question
Which one of the following is an incorrect combination
Adenine, thymine, cytidine
Adenine, cytosine, thymine
Guanine, thymine, uracil
Cytosine, uracil, guanine
Solution
A.
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).
