Between which two oxidation states does the iron ion of a cytochrome fluctuate as it passes electrons?
ABetween a solid and a dissolved state
BBetween a bonded and an unbonded state
CBetween an acidic and an alkaline state
DBetween a reduced and an oxidized state
Answer & Solution
Correct answer: D. Between a reduced and an oxidized state
1. The heme in a cytochrome carries electrons rather than oxygen.
2. Its central iron ion is reduced when it takes an electron and oxidized when it gives one up.
3. It therefore fluctuates between different oxidation states as electrons pass through.
4. This cycling is what lets one carrier serve the chain over and over again.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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