List and discover the functions of carbohydrates.

Carbohydrates perform the following functions:
1. Energy. Glucose is the main source of energy in the body. When 1 g of glucose is burned, 17.6 kJ (4.2 kcal) of energy is generated.
2. The signal. Carbohydrates are part of the glycoprotein receptors, expanded on the surface of the cell membrane.
Z. Reserve. Carbohydrates provide a supply of nutrients in the cell in the form of starch grains or clumps of glycogen.
4. Plastic. Carbohydrates form the cell wall of plants (cellulose), fungi (chitin); form the external chitinous skeleton of arthropods.

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