 Quote by selfAdjoint
..and where does the free energy come from?
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What do you mean, the free energy comes from the oxidation of (in)organic compounds.
There are different kinds of chemotrophy:
chemoautotroph- Organism that obtains energy from the oxidation of reduced inorganic compounds or elements and obtains carbon from carbon dioxide.
chemolithotroph- Organism that obtains energy from the oxidation of inorganic compounds and uses inorganic compounds as electron donors.
chemoheterotroph- Organism that obtains energy and carbon from the oxidation of organic compounds (we humans).
chemoorganotroph- Organism that obtains energy and electrons (reducing power) from the oxidation of organic compounds.