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Adenosine Triphosphate All living organisms require a continuous supply of energy to survive. At any one time there are millions of chemical reactions occurring simultaneously, with some reactions requiring energy and others releasing energy. The combination of simultaneous interrelated chemical reactions taking place at any given time in a cell at any given time is referred to as metabolism. Energy is needed in biological organisms for: - synthesis of chemicals - active transport - mechanical movement The three processes that are listed above are classified as work, which is done by a living organism. There are two main types of reactions which occur in all cells; energy requiring reactions - endergonic, and energy yielding reactions - exergonic. In cells, most energy requiring reactions are involved in synthesizing needed biological molecules - amino acids, nucleic acids, fats, proteins and carbohydrates. Together, these biosynthetic reactions are called anabolism. Conversely, most energy yielding reactions in cells...

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