When two monosaccharides join together by a condensation reaction, they form a disaccharide. When there's more than two, they form a polysaccharide chain. Disaccharides are sugars formed when two monosaccharides join together. They form by a glycosidic bond.
You need to remember what monosaccharide forms what disaccharide.
It might be an easy mark in Paper 1 or Paper 3!
| Monosaccharides | Monosaccharides |
|---|---|
| glucose + glucose | maltose |
| glucose + fructose | sucrose |
| glucose + galactose | lactose |