In mitochondria, NADH supplies electrons to the electron transport system and molecular oxygen (with the highest affinity for electrons) is the final receiver. In photosynthesis, however, the oxygen in water (H2O) is the source of electrons and the final receiver is NADP+. How can oxygen act as both a donor and receiver of the electrons?
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You are working with pyruvate molecules that contain radioactive carbon. They are incubated with all the components of the Citric Acid cycle long enough for one turn of the cycle. Carbon dioxide is produced, but only one third of it is radioactive. How can this observation be explained?
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