Cellular Respiration and Fermentation. sun. light energy. . CO 2. +. H 2 O. +. +. O 2. C 6 H 12 O 6. glucose. H 2 O. ATP energy. +. . +. +. O 2. CO 2. H 2 O. C 6 H 12 O 6. even though this equation is a bit of a lie … it makes a better story. Energy cycle.
2 ATP needed
If no oxygen is present then fermentation occurs
2 ATP produced
34 ATP produced
4 ATP produced
Both processes require oxygen and occur in the mitochondria
Both processes do not require oxygen (anaerobic) and occur after glycolysis.