Physiological significance of (1): energy is produced, not substance, and the amounts of oxaloacetic acid and citric acid remain unchanged during the whole reaction.
(2) Key enzymes: citrate synthase, isocitrate dehydrogenase and α -ketoglutarate dehydrogenase (two lemons and one ketone).
Characteristics of all key enzymes: rate-limiting enzyme and unidirectional enzyme.
Formation of water-dehydrogenation formation.
(3) Six key substances: memory: mono (acetyl coenzyme A) succinic acid (succinic acid) citric acid (α-ketoglutarate) grass (oxaloacetic acid) apple (malic acid).