THIS USER ASKED ๐
Which of the following is true concerning oxygen in regards to aerobic respiration? a. it is the only substrate of aerobic respiration. b. it directly receives electrons and protons from nad+ and fad. c. it is the final electron acceptor in aerobic respiration. d. it directly transfers electrons and protons to nad+ and fad. e. it transports electrons to the mitochondrion.
THIS IS THE BEST ANSWER ๐
C is the correct answer. It is the ultimate electron receiver in aerobic respiration.
Explanation:
Oxygen is a substrate of aerobic respiration, but it is not the only one. Glucose is also a substrate.
Oxygen is used in the cells to act as the ultimate electron receiver, this means it receives the electrons from NADH and FADH2. This is why, when no oxygen is available for aerobic respiration, the NADH and FADH2 cannot be oxidized and thus remain in their reduced form. As a result, they cannot be reused during various cellular processes dependent on NAD + and FAD, such as glycolysis, pyruvate oxidation and cellular respiration. This means that ATP synthesis stops.
Oxygen itself carries no electrons, this is carried by the cytochrome complex in the mitochondrial membrane. But oxygen is crucial to get those electrons, so a very important piece of electron transport throughout the mitochondria.
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