Glycolysis

Glycolysis is the first step in the breakdown of glucose to extract energy for cellular metabolism.

Electrons can enter the electron transport chain at three levels: dehydrogenase, the quinone pool, or a mobile cytochromeelectron carrier.

The amount of energy (as ATP) gained from glucose catabolism varies across species and depends on other related cellular processes.

Respiration is one of the key ways a cell gains useful energy to fuel cellular activity.