O 2 from leaving the plant. In the light reaction, the energy used to produce ATP comes from a. H 2 O is reduced and CO 2 is oxidized e. Cyanide is a poison that blocks the electron transport chain. When this happens glycolysis and the Krebs cycle quickly stop because a. electrons are no longer available from the electron transport chain.
Proteins are excellent molecules for fueling cellular respiration.
Fermentation is essentially glycolysis plus an extra step in which pyruvate is reduced to form lactate or alcohol and carbon dioxide. This last step a. extracts a bit more energy from glucose.