1. Proteins are organic compound containing carbon,hydrogen, oxygen and nitrogen.
2. Sulphur and phosphorus are sometimes present.
3. A molecule of protein is made up of large number of subunits called amino acids.
4. Proteins are needed for growth and the repair of body tissues.
5. They are also needed for formation of enzymes, hormones, haemoglobin and antibodies.
6. Examples of proteins are milk, fish, eggs, chicken and bean curd.
Proteins are made by connecting amino acids together. Here the acid end of glycine will connect to the amino part of alanine. A water is released in the process.
