22 December 2012

#29 Main nutrients: carbohydrates, fats and proteins

Nutrition: taking in of nutrients which are organic substances and mineral ions, containing raw materials or energy for growth and tissue repair, absorbing 
assimilating them.

Main nutrients 


Large carbohydrate molecules such as starchglycogen and cellulose are made up of long chains of smaller units - monosaccharides such as glucose - held together by chemical bonds. 

Each hexagon represents a glucose monomer.

Fats are needed for energy and keeping warm.

Fats are made up of 3 units of fatty acids chemically bonded to 1 glycerol unit. 


Proteins are needed for growth, repair and fighting disease.

Proteins are made of long chains of amino acids chemically bonded together. There are about 20 different amino acids, their pattern in the chain can be quite complex and the molecules can be very large. 

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