How many large multiprotein complexes and how many small diffusible carriers make up the electron transport chain?
ASix complexes and one carrier
BFour complexes and two carriers
CThree complexes and three carriers
DTwo complexes and four carriers
Answer & Solution
Correct answer: B. Four complexes and two carriers
1. The chain is composed of four large multiprotein complexes embedded in the inner mitochondrial membrane.
2. Two small diffusible electron carriers shuttle electrons between those complexes.
3. Those mobile carriers are ubiquinone and cytochrome c.
4. The complexes are labelled one to four, which is the quickest way to remember the count.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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