All of the following are respiratory enzyme complexes involved in the electron transport chain except?

a. NADH dehydrogenase

b. NADPH dehydrogenase

c. Cytochrome C reductase

d. Cytochrome C oxidase

NADPH dehydrogenase.

Explanation:

Electron transport chain may be defined as the sequential steps of transfer of electrons through the complexes and couple with proton gradient. The ATP is generated by the electron transport chain.

NADPH dehydrogenase is an ezymes that are used for the conversion of NADPH into NADH+. The NADH dehydrogenase is complex I of the electron transport chain. The NADPH dehydrogenase is not the enzymes complexes and not involved in the electron transport chain.

Thus, the correct answer is option (b).