Chemistry - Biomolecules Question with Solution | TestHub

A combination of a nitrogen base with a pentose sugar is known as nucleoside. The given figure $\mathrm{B}$ is of adenosine (adenine + ribose) while $C$ is of uridine (uracil + ribose). $\mathrm{A}$ is nitrogen base adenine (purine) and $\mathrm{D}$ is adenylic acid (nucleotide)