1. CHEMICAL COMPOSITION OF THE CELL

2. Chemical composition of cell. As we know that all living bodies are made up of cells and cell contains living matter called protoplasm. Actually chemical composition of protoplasm still not known perfectly. How ever chemically it contains 70 to 90% water and other molecules. The organic molecules contain elements such as carbon, hydrogen, nitrogen, oxygen, phosphorus and sulphure. They make up about 90% of biochemical which ultimately make up the body of living organisms.

3. CHEMICAL COMPOSITION OF CELL  Following are the some properties and function of these elements. ELEMENT.ATOMIC NO/ WEIGHT. MOLECUL AR FROM. FUNECTION. Carbon6/12Co2 Basic elements of organic compounds fix during photosynthesis. Hydrogen1/1H2OIt is a raw material of plants in photosynthesis. Oxygen8/16O2Use in aerobic respiration. Nitrogen7/14NO3-NH4 Use formation of amino acids and protenis,nucleic acid, harmones,co- enzymes. Phosphorou s 15/30H2PO4- HPO4 Component of nucleic acids,ATP, phospholipids, co-enzyme etc. Sulphur16/32SO4, H2SO4 Components of proteins and enzymes.

4. Chemical composition of a Mammalian cell. The following table indicates the approximate chemical composition of the mammalian cell. S. No:Chemical component Mammalian Cell 1.Water70% 2.Proteins18% 3.Carbohydrates4% 4.Lipids3% 5.D.N.A0.25% 6.R.N.A1.10% 7.Enzymes, Harmones2% 8.Inorganic Ions1%