All living cells are made up of seven types of substances: water, carbohydrates, fats and oils (lipids), proteins , minerals , vitamins and nucleic acids. The most important need of a cell is to get these materials for its growth and reproduction. The numerous metabolic reactions that occur inside a living cell arise from this need the anabolic reactions, which give rise to growth and Reproduction, require energy. This is released in catabolic reactions. These metabolic reactions are essential for life. If they stop, the cell dies.
Basically, the properties and functions of a multicellular organism are the sum total of the properties and functions of its constituent cells.
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