​When Hydrogen Ions Accumulate in the Mitochondrial Intermembrane Space, What

question 8

Multiple Choice

​When hydrogen ions accumulate in the mitochondrial intermembrane space, what prevents them from moving back into the mitochondrial matrix without flowing through ATP synthase?

• A)​The hydrophilic environment of the mitochondrial matrix repels hydrogen ions.
• B)​The hydrophobic environment of the mitochondrial matrix repels hydrogen ions.
• C)​Hydrogen ions combine with oxygen gas to form water, which cannot cross the lipid bilayer of the mitochondrial membrane.
• D)​Hydrogen ions cannot cross the lipid bilayer of the mitochondrial membrane.
• E)​Entering the matrix would require the ions to move against their concentration gradient.

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