G, Fermentation
➢ In anaerobic environments, cellular respiration doesn’t work
- No ETC, so electron carriers are useless
- No Acetyl CoA or Citric Acid cycle
- Only glycolysis can occur
➢ Glycolysis produces 2 pyruvate and $\text{2 NADH}$
- In order to recycle NADH, pyruvate takes its electrons, creating lactic acid in muscles or ethanol in yeast
■ Both products are unfortunately toxic - ATTP created through substrate-level phosphorylation
➢ Common in bacteria
- In some, an ETC may exist, but $SO_4$ is the electron acceptor instead of $O_2$, creating $H_2SO_4$ as a byproduct
