Identify the type of sugar present in the structure of vitamin B ₁₂ shown below:

Step-by-step solution

Based on the provided structure of Vitamin B₁₂ , the sugar moiety is located in the lower part of the molecule, connecting the phosphate group to the dimethylbenzimidazole ring. Let us count the number of carbon atoms in this sugar unit: 1. The sugar is in a five-membered cyclic form (furanose ring) which contains one oxygen atom and four carbon atoms in the ring. 2. Attached to one of the ring carbons is a - CH ₂ OH group, which contains one additional carbon atom. 3. Counting them all: C1' (attached to the nitrog