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The mobile carrier connecting the first and second complexes to the third is:
ACytochrome c
BUbiquinone
COxaloacetate
DFlavin adenine
Answer & Solution
Correct answer: B. Ubiquinone
1. Some carriers are fixed inside complexes and others shuttle between them.
2. One small lipid-soluble molecule links the early complexes to complex III.
3. The compound connecting the first and second complexes to the third is ubiquinone.
4. Complex I itself is composed of flavin mononucleotide and an iron-sulfur containing protein.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_
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