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A combination of a nitrogen base with a pentose sugar is known as nucleoside. The nitrogen base combines with the sugar molecule at its 1' carbon atom in a glycosidic bond (C – N – C) by one of its nitrogen atoms (usually 1 in pyrimidines and 9 in purines). Depending upon the type of pentose sugar, nucleosides are differentiated into ribonucleosides and deoxyribonucleosides.

1. Nucleosides are formed by the combination of a nitrogen base and phosphate group.
2. Nucleosides are formed by the combination of a nitrogen base and a pentose sugar.
3. Nucleosides are formed by the combination of a pentose sugar and phosphate group.
4. Nucleosides are formed by the combination of a nitrogen base, pentose sugar, and phosphate group.

Correct answer: Nucleosides are formed by the combination of a nitrogen base and a pentose sugar.

Solution

The correct choice is the one that pairs a nitrogenous base with a pentose sugar. Phosphate is not part of a nucleoside; once phosphate is added, the molecule becomes a nucleotide.

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