The sugar unit present in the nucleotides of `RNA` is

Options

A. L- ribose
B. L- ribulose
C. D- ribose
D. L-ribose

Answer

C

Explanation

The sugar is `D-` ribose in the group of nucleic acids known as ribonucleic acis `(RNA)`, and `D -2` dexoyribose in the group known as dexyribonucleic acids `(DNA)`. The profix 2- dexoy simply indicates the lack of an `-OH` group at the 2-position. The sugar units are in the furanose form, and are joined to phosphate through the `C - 3` and `C - 5` hydroxyl groups.
Thus, the ribose sugar that takes part in the formation of `RNA` is actually `beta -D` ribofuranose while the sugar unit present in is actually `beta -D` ribofuranose while the sugar unit present in a `DNA` molecule is actully 2 - deoxy - `alpha-D`- ribofuranose.