Question

In ETS, complexes I and IV are respectively

• A. NADH dehydrogenase and FADH${}_2$.
• B. FADH${}_2$ and NADH dehydrogenase.
• C. NADH dehydrogenase and cytochrome oxidase complex.
• D. NADH dehydrogenase and ATP synthase.

Answer 1

Answer: (C)

NADH dehydrogenase and cytochrome oxidase complex.

The metabolic pathway through which the electron passes from one carrier to another is called an electron transport system. The process is carried out by the four different complexes that carry electron from one to another complex. These are:-

Complex I - NADH-coenzyme Q oxidoreductase or NADH dehydrogenase

Complex II - Succinate-Q oxidoreductase

Complex III - Q-cytochrome C oxidoreductase

Complex IV - Cytochrome C oxidase

So the correct option is 'NADH dehydrogenase and cytochrome oxidase complex'.