The number of adenosine triphosphate molecules obtained is directly proportional to which quantity?
AThe number of protons pumped across the membrane
BThe number of carbon atoms fed into the cycle
CThe number of enzymes present in the matrix
DThe number of water molecules split per second
Answer & Solution
Correct answer: A. The number of protons pumped across the membrane
1. Adenosine triphosphate is made when protons flow through the enzyme that phosphorylates adenosine diphosphate.
2. The number ultimately obtained is directly proportional to the number of protons pumped across the inner mitochondrial membrane.
3. So anything that reduces proton pumping reduces the yield.
4. Splitting water is a photosynthetic event and has no place in this chain.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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