Answer:
Complex organic food
molecules such as sugars, fats and proteins are rich sources of energy for
cells because much of the energy used to form these molecules is stored within the
chemical bonds that hold them together. The cells release the stored energy
through a series of oxidation reactions.
During each
oxidation reaction involved in food breakdown, the product of reaction has a lower
energy content than the donor molecule. At the same time, electron acceptor molecules
capture some of the energy lost during oxidation and store it for later use.
Cells
convert the energy from oxidation reactions to energy-rich molecules such as
ATP which can be used through! the cell to power metabolism and construct new
cellular components.
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