Biomolecules

In D (+) Glucose, D represents the configuration similar to D-Glyceraldehyde

In monosaccharides, aldoses are reducing sugars while ketoses are non-reducing sugars

Polysaccharides are known as non-sugars as they are not sweet in taste

D (-) fructose forma a five membered ring known as furanose which is in analogy with the compound furan