Developed ubiquinone as a new "fuel"
The substance is called ubiquinone but is also called coenzyme Q10. The bacteria had hitherto used naptoquinone as an energy agent, but because the oxygen concentration in the atmosphere had suddenly become significantly higher, the bacteria needed an alternative quinone form that could simultaneously protect them from the oxygen. Oxygen is a double-edged sword, as it is life-giving on the one hand and can form highly destructive oxygen compounds (free radicals) on the other. Here, ubiquinone has the advantage of attaching to the oxygen, where as naptoquinone tends to drop the oxygen ions to form harmful oxygen compounds.