Most use iron, sulfur, hydrogen compounds for energy making. This is problematic for some of the world's art treasures. Yes, this group. This variety depends on enzymes and their cofactors and coenzymes . We exploit the variability of bacterial enzymes and cofactors to control them and also to identify them.
First part is glycolysis- anaerobic oxidation of glucose to pyruvate.
Glucose is phosphorylated as it is taken across the cell membrane so that glucose isn't entering across a negative concentration gradient requiring more energy input. Electron transport is like a waterfall. The electrons are passed from coenzyme to coenzyme and they lose energy with each transfer. Very efficient system. Only in the last step of electron transport.