The two forms of glucose differ by the position of the OH group.
In case of alpha glucose, the hydroxyl group that is attached to the C-1 is below ( or on the opposite side) when compared with the CH2OH group that is present on the fifth carbon C-5.
On the other hand, in case of beta-D glucose, the OH group is on the same side or above the ring, when compared to the CH2OH group that is present on the fifth carbon C-5.
Biomolecules are the most essential organic molecules, which are involved in the maintenance and metabolic processes of living organisms. These non-living molecules are the actual foot-soldiers of the battle of sustenance of life.
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids.