Cytochrome proteins carry a prosthetic group of heme. How does this heme differ from the heme in haemoglobin?
AIt carries no metal ion at its centre
BIt carries a copper ion rather than iron
CIt carries electrons rather than oxygen
DIt carries carbon dioxide rather than oxygen
Answer & Solution
Correct answer: C. It carries electrons rather than oxygen
1. Cytochrome proteins have a prosthetic group of heme.
2. That heme molecule is similar to the heme in haemoglobin.
3. The difference is its cargo, since it carries electrons rather than oxygen.
4. The iron ion at its core is reduced and oxidized as it passes electrons along.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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