As opposed to an EX [as in expel] -ergonic chemical reaction,
endergonic reactions absorb energy.
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An endergonic reaction is a chemical reaction in which the
standard change in free energy is positive.
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An endergonic reaction is a chemical reaction in which the
standard change in free energy is positive, and energy is absorbed.
To view the source and read more about endergonic reactions go to:
http://en.wikipedia.org/wiki/Endergonic_reaction