Amino acids
| Proteins are a class of biologically important substance. They are vital to virtually all procedures in living systems. Some of acids are hormones which provides as chemical messengers that coordinate certain biochemical activities. Some proteins give out to transport the substances through the organism. Proteins are also available in toxins (poisonous materials) as well as in antibiotics. All the proteins are building up of many amino acid units linked together into a large chain. An amino acid is a bifunctional organic molecule that contains both a carboxyl group set, -COOH, as well as an amine group set, -NH2.
![1237_amino acid.png](https://www.expertsmind.com/CMSImages/1237_amino%20acid.png)
(R may be alkyl, aryl or any other group)
The proteins be different in the nature of R-group bonded to α-carbon atom. The nature of R-group determines the properties of proteins. There are about 20 amino acids which make up the bio-proteins. Out of these 10 amino acids (non-essential) are synthesised by our bodies and rest are essential in the diet (essential amino acids) and supplied to our bodies by food which we take because they cannot be synthesised in the body.
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