NEET BIOLOGY Unit 18 Biomolecules ORGANIC COMPOUNDS : 1. Proteins = 7–14% 2. Lipids = 1–3% 3. Carbohydrates = 1–2% 4. Nucleic acids, enzymes and other = 1-3% INORGANIC COMPOUNDS : 1. Water = 70–90% 2. Salts, acids, bases, gases = 1– 3% WATER : (1) Water in human body - 65-70% of total body weight. (2) Of total water, 95% water is free water and 5% water occurs as bound water. (3) It causes streaming or cyclosis in protoplasm transportation of solutes from one part to the others. (4) Having a high specific heat, it minimizes temperature variations and thus protects protoplasm against ill effects of sudden rise or fall of temperature in the environment. (5) Being an ideal dispersion medium, it causes Brownian movement of colloid particles, resulting into their collision and mutual bombardment. This facilitates reactivity between the various compounds necessory for maintaining protoplasm in live state. (7) It is a best solvent in nature, it forms the fluid matrix of protopla...
