Electron transport is coupled to ATP synthesis in mitochondria, in chloroplasts, and in the thermophilic bacterium Methanococcus

Which of the following is likely to affect the coupling of electron transport to ATP synthesis in all of these systems?
(a) a potent inhibitor of cytochrome c oxidase
(b) the removal of oxygen
(c) the absence of light
(d) an ADP analog that inhibits ATP synthase


(d) All chemiosmotic coupling systems involve a proton gradient that ATP synthase uses to bind to ADP and phosphorylate it. Hence, agents that prevent ADP from binding the synthase or that dissipate the proton gradient affect all chemiosmotic systems. Cytochrome c oxidase and oxygen are required only for mitochondria and aerobic bacteria (not Methanococcus); light is required only for chloroplasts and photosynthetic bacteria (not Methanococcus).

Biology & Microbiology

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Biology & Microbiology