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Bioenergetics Part 3: The Payoff

An interactive quiz on Oxidative Phosphorylation and Fermentation.

Mission Control

Problem 16: The Uncoupler's Effect

Hard

ETCChemiosmosisInhibitionATP Synthesis

Dinitrophenol (DNP) is a chemical that makes the inner mitochondrial membrane permeable to protons (H⁺). What is the most likely effect of exposing a cell to DNP?

A

The rate of ATP synthesis and oxygen consumption will both increase.

B

Electron transport will stop, and oxygen consumption will halt.

C

The proton gradient will be dissipated, and ATP synthesis will stop, but oxygen consumption will continue.

D

Protons will be pumped out of the matrix at a faster rate, but ATP synthesis will stop.

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