- human cells (eukaryotes) can utilize the Kreb's cycle pathway to generate more ATP after glycolysis, but most bacteria cannot utilise the Kreb's cycle
- plant cells can utilise the Calvin's cycle for photosynthesis but human cells cannot.
- yeast can utilise the ethanol fermentation pathway but human cells can only utilise the lactic acid fermentation pathway.
Why can't humans use the Calvin's cycle? Or why can't yeast use the lactic acid fermentation pathway instead? What determines the metabolic pathways that a biological cell is able to utilise?