Under the concept of biological oxidation and reduction, what do "soluble electron carriers" mean an

[m25]

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Under the concept of biological oxidation and reduction, what do "soluble electron carriers" mean and what are they?

 

[Zoey_imbmida]

Using Electron Transport Chain as an example, electron carriers are reducing agents that can carry e-, and pass e- to O2, and release energy to make ATP at the end.
water-soluble ones are free-floating in the cytosol (e.g. NADH, FADH2 etc
lipid-soluble ones are embedded in the membrane (e.g. CoQ, FMN etc