Chapter 18, Problem 18.72AP

Interpretation Introduction

Interpretation:

Importance of movement of ${\text{H}}^{+}$ ion across inner mitochondrial membrane and return passage through ${\text{H}}^{+}$ ion channel in ATP synthase has to be determined.

Concept Introduction:

Electron transport chain and oxidative phosphorylation is fourth stage for energy production. In this stage, ${\text{O}}_2$ converts into water by help of NADH and ${\text{FADH}}_2$ coenzymes. ATP is also produced in this stage. Reaction of formation of water is as follows:

  ${\text{O}}_2+4{\text{e}}^{-}+4{\text{H}}^{+}\to 2{\text{H}}_{\text{2}}\text{O}$

Four complexes are associated with electron transport chain that is present in inner mitochondrial membrane. These complexes are as follows:

Complex I: NADH-coenzyme Q reductase

Complex II: Succinate-coenzyme Q reductase

Complex III: Coenzyme Q-cytochrome reductase

Complex IV: Cytochrome c oxidase