Question

The ultimate electron acceptor of respiration in aerobic organism is

• A. Cytochrome
• B. Oxygen
• C. Hhydrogen
• D. Glucose

Answer 1

The correct option is B Oxygen

The electron transport chain catalyses an electron flow from NADH $\left({FADH}_2\right)$ to oxygen, which is the final electron acceptor of the respiratory process. It produces water in the mitochondrial matrix.

$NADH+H^{+}\rightleftharpoons {NAD}^{+}+{2H}^{+}+{2e}^{-}$

${FADH}_2\rightleftharpoons FAD+{2H}^{+}+{2e}^{-}$

$\frac{1}{2}{O}_2+{2H}^{+}+{2e}^{-}⟶H_{2}O$

So the correct option is B.