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Transcript
Proteins Functions: 1. To build and repair cell structure 2. To speed up chemical reactions (done by a special group of proteins called enzymes) 3. As a last resort, to be used as energy. Composed of: small units called amino acids bonded together There are only 20 types of amino acids, but there are millions of proteins. Therefore the number of amino acids, and their sequence determine the protein. Only 12 of the amino acids can be made by our body, the rest have to come from our food (meat, nuts). These 8 are called Essential Amino Acids. Generally, amino acids look like: molecules A chain of amino acids is called a polypeptide. It isn't called a protein at this point because it does not become functional until it folds into the proper shape. If a protein loses its shape, it stops working. This is called denaturation.
