Coenzyme

... such as dopamine, serotonin. Methylation is also required for the biosynthesis of melatonin and the electron transport chain constituent coenzyme Q10.

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... not "Ox.-Aloacetate". 2. Sorry, I mistyped that, obviously succinic acid is C4H6O4. 3. Yes, succinate does pass electrons to Coenzyme Q (Q to QH2) but I thought you were referring to it entering "a stage" of oxidative phosphorylation, not primarily the electron transport ...

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... and oxaloacetate 2) no, succinate is not C4O4, you're forgetting hydrogens :roll: 3) succinate doesn't enter the ETC. It just passes electrons to coenzyme Q, but otherwise is involved in TCA cycle, not in ETC

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... 2) Yes, it is only the carboxyl group, C4O4 succinic acid has 6 hydrogen atoms. 3) Yes, oxidative phosphorylation, after a coupled reaction with Coenzyme Q to QH2 with the enzyme succinate dehydrogenase.

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... cytoplasm with no organelles). 2) Pyruvate will enter the tricarboxylic acid cycle, be catabolised by pyruvate dehydrogenase into either Acetyl Coenzyme A or Ox.-Aloacetate. Then, the reduced nicotinamide adenine dinucleotide (NADH) and Succinate (C4O4) will enter an electron transport chain ...

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