Plant Structure
Which of the following experimental results does not support Mitchell's chemiosmosis theory?

Electron transport in isolated mitochondria was shown to result in acidification of the medium
Addition of dinitrophenol to isolated mitochondria during electron transport was shown to inhibit acidification of the medium
An artificial proton gradient across the inner mitochondrial membrane drives ATP synthesis in the absence of electron transport
Addition of dinitrophenol to isolated mitochondria was shown to inhibit electron transport, but had no effect on ATP synthesis

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Plant Structure
Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?

Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions
The rules governing oxidation and reduction apply only in vitro, and not in vivo
Electrons always go from reductants with high redox potentials to oxidants with low redox potentials
None of these

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Plant Structure
Cellular metabolism is an example of

a series of reactions occurring under standard conditions
equilibrium metabolism
a series of reactions that defy the second law of thermodynamics
steady-state metabolism

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