Which integral membrane protein lets hydrogen ions cross the inner mitochondrial membrane and uses their movement to make adenosine triphosphate?
AThe cytochrome complex
BThe sodium-potassium pump
CThe GLUT transporter protein
DThe ATP synthase complex
Answer & Solution
Correct answer: D. The ATP synthase complex
1. Hydrogen ions cannot cross the nonpolar region of a membrane unaided.
2. ATP synthase is the membrane-embedded protein complex through which they pass.
3. It adds a phosphate to adenosine diphosphate using energy from the protons diffusing through it.
4. The GLUT transporter moves glucose and has nothing to do with proton flow.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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