Proteins make up your hair, nails, fat, in the form of haemoglobin they carry oxygen in your blood and help if you are injured by clotting the blood.
All proteins contain carbon, hydrogen, oxygen and nitrogen. The are made of a long chain of smaller, soluble molecules, amino acids. These amino acids are joined together by a long chain called polypeptide.
The sequence of every amino acid in this chain is specific to every protein. On the surface of the molecules there is a deppression or a pocket called the binding site which other molecules can fit into.
Some proteins form minute fibres which give structure to tissues such as muscle tissue.
Proteins also make up hormones and antibodies.
Antibodies are produced by white blood cells to fight antigens which helps us against harmful microorganisms.
There are also protein enzymes which speed up reactions as a biological catylist.
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