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Main source of energy in cells is by burning the glucose, fats and excess of amine acids, by a process called biological oxidation. In all these, we get organic molecules of lower and lower energy level and releasing energy step by step, witch is trapped in making by converting ADP into ATP and some part into heat energy. For example, there are almost 20 steps through witch we come down in breaking glucose into final products of oxidation. (C O 2 and H 2 O. )

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