A metabolic cell contains a large amount of water. About 90 percent of the bulk of a living cell is made of water. Water does not occur in pure state in the cell, but contain inorganic and organic substances. Some of these substances are dissolved in it. Thus, these substances, either form true solutions, or colloidal systems. In order to understand the state of particles of such material in the aqueous system of the cell, it is essential to know the nature and characteristics of a solutions and colloidal systems.

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