$(A)$ nucleoside is formed by the combination of a pentose sugar and a nitrogenous base.In contrast, a nucleotide is formed when a phosphate group is

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$(A)$ nucleoside is formed by the combination of a pentose sugar and a nitrogenous base.In contrast, a nucleotide is formed when a phosphate group is added to a nucleoside.Therefore, the correct composition of a nucleoside is: $\text{Nucleoside} = \text{Sugar} + \text{Nitrogenous base}$.