One molecule of glucose contains more than 90 times the amount of energy stored in a single molecule of ATP; however, ATP is used as an immediate source of energy by the cell.
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Although glucose contains much more energy than ATP, it is not used as an immediate source of energy for the cell because it is a fast way to transfer energy. Glucose, though, is the long-term way to store energy in the cell. A cell typically only stores about a few seconds' worth of energy in the form of ATP for use immediately.