Figure 16-21. Heme prosthetic groups of respiratory-chain cytochromes in mitochondria.

Figure 16-21Heme prosthetic groups of respiratory-chain cytochromes in mitochondria

Note the differences in substituents on the porphyrin rings. Hemes accept and release one electron at a time.

From: Section 16.2, Electron Transport and Oxidative Phosphorylation

Cover of Molecular Cell Biology
Molecular Cell Biology. 4th edition.
Lodish H, Berk A, Zipursky SL, et al.
New York: W. H. Freeman; 2000.
Copyright © 2000, W. H. Freeman and Company.

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