Since proteins are composed of the same limited number of amino acids, why are they all so different?
Proteins are not composed of the same number of amino acids. But if you meant types, then yes they are rather limited. However, because of the different numbers of amino acids; the order of the amino acids; the secondary structures of the protein and finally the tertiary and quaternary structures of protein; makes the protein functions and structures different from each other. Sounds kind of confusing but I hope it helps.
Proteins are complex molecules that are formed from Amino Acids. They are considered as one of the most essential elements for the living cells. Basic function of Protein is to provide growth and repair to body cells. They also provide necessary energy source to the body. There are different kinds of proteins. Monomeric proteins are molecules that are consist of one polypeptide chain. A protein which is consisted of more than polypeptide chains is called Oligomeric. Scientists have also defined Proteins based on their chemical composition and are basically divided into two large groups or classes. Simple proteins are only composed of simple amino acids and include some organic and inorganic groupings while the subjugated proteins, the other class of proteins, include carbohydrates. Proteins are also classified on their biological functions. Proteins include Enzymes which are being used by the body as a catalyst to expedite certain reactions of different living cells. Proteins which are
