Q.Describe, in general terms, how a glycosidic bond is formed between two monosaccharide units.

Two monosaccharide units are joined into a disaccharide (or, repeated many times, a polysaccharide) through a glycosidic bond, which is formed the same way an ether-type linkage would be formed by loss of water between two $-\text{OH}$ groups. Typically, it is the anomeric hydroxyl group of one monosaccharide (the $-\text{OH}$ at the ring carbon derived from the original carbonyl carbon) that reacts with an ordinary (non-anomeric) hydroxyl group of the second monosaccharide -- though in some disaccharides, such as sucrose, the anomeric hydroxyls of both units are involved. …

Recognise glycosidic bond formation as a condensation (loss-of-water) reaction between two hydroxyl groups on two separate monosaccharide rings, exactly analogous to how an es …

Thinking a glycosidic bond can only ever involve the anomeric carbon of one unit -- most do, but as sucrose shows, both un …