Which Component of the Electron-Transport Chain is NOT an Integral

Question

Which component of the electron-transport chain is NOT an integral membrane protein?
A) NADH dehydrogenase
B) cytochrome c
C) cytochrome oxidase
D) ubiquinone:cytochrome c oxidoreductase
E) succinate dehydrogenase

Accepted Answer

Cytochrome c is not an integral membrane protein; it is a soluble protein that shuttles electrons between complex III and complex IV in the electron-transport chain. The other components listed are all integral membrane proteins.