To identify the missing substance in the electron transport chain sequences. Concept introduction: Electron transport chain is a sequence of biochemical reactions in which electrons and hydrogen atoms from the citric acid cycle are transferred to various intermediate carriers and finally reacts with molecular oxygen to form a water molecule. There are four complexes associated with the electron transport chain that is present in the inner mitochondrial membrane. The four complexes that help in the electron transfer in the electron transport chain are: Complex I: NADH-coenzyme Q reductase Complex II: Succinate-coenzyme Q reductase Complex III: Coenzyme Q-cytochrome c reductase Complex IV: Cytochrome c oxidase An overview of the electron transport chain is as follows:
