Why is there a range of 30-32 ATP molecules produced from one glucose molecule?
◦ Individual variation is normal among cells.
◦ Sometimes the electron transport system is more efficient than other times.
◦ The NADH molecules produced during glycolysis are in the cytoplasm; occasionally, electrons are carried by the lower energy FADH2 instead of NADH.
◦ Any of these answers may work under different cellular conditions.