Question

Distinguish between nucleotide and nucleoside

Answer 1

NUCLEOSIDE
A 'nucleoside' consists of a nitrogenous base covalently attached to a sugar but without the phosphate group.
NUCLEOTIDE
A 'nucleotide' consists of a nitrogenous base, a sugar and one to three phosphate groups.

Answer 2

Answer:

A nitrogenous base combines with C1 of pentose sugar with the help of N - glycosidic bond to form nucleoside.

Now a phosphate combines with sugar molecule (of the nucleoside) at C5 with the help of ester bond to form nucleotide.

Thus,

Nitrogenous base + Pentose sugar = Nucleoside

Nitrogenous base + Pentose sugar + Phosphate = Nucleotide

                                                  Or

Nucleoside + + Phosphate = Nucleotide

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