Cellular respiration and photosynthesis each employ an electron transport chain. What below do the two electron transport chains not have in common? They both generate a proton (H+) gradient across a membrane They both involve reduction of O2 to water They both occur in plant cells They both are embedded within a membrane They both are used to synthesize ATP
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Respiration and the light reactions of photosynthesis have several features in common. Which of the following is NOT a common feature? Both use an electron transport chain. Both couple the energy in Redox reactions to the translocation of protons across a lipid bilayer membrane. Both have a primary function of reducing NAD+ to NADH Both can generate ATP by using the energy stored in a proton gradient to drive ATP synthase. Both require membranes for key reactions in their respective processes.
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Photosynthesis and aerobic respiration are similar in some respects. Both have an electron transport chain which is used to generate a proton gradient. The electrons that enter the ETC in mitochondria come from NADH and FADH2 molecules. The oxidized NAD and FAD molecules get new electrons from reactions in glycolysis, pyruvate oxidation, and the citric acid cycle. But where do the electrons come from to enter the chloroplasts ETC at photosystem II? In other words, what molecule is oxidized to begin the process and how is that electron replaced?
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