Answer & Explanation
Carbohydrates are also called as saccharides are molecular compounds made from just three elements:
carbon, hydrogen and oxygen.
* a source of energy for the body e.g. glucose and a store of energy, e.g. starch in plants
* building blocks for polysaccharides (giant carbohydrates), e.g. cellulose in plants and glycogen in the human body
* components of other molecules eg DNA, RNA, glycolipids, glycoproteins, ATP
1. Monosaccharides (e.g. glucose) and
2. Disaccharides (e.g. sucrose) are relatively small molecules. They are often called sugars.
3. Other carbohydrate molecules are very large called Polysaccharides such as starch and cellulose.