Question

How many complexes are there in ETC?

Answer 1

Electron Transport Chain:

1. It occurs in both photosynthesis and cellular respiration processes.
2. It takes place in mitochondria.

Steps involved in ETS:

1. Proton gradient is generated across the mitochondrial membrane.
2. In the mitochondrial intermembrane space accumulation of proton takes place.
3. Formation of water and reduction of oxygen here, oxygen acts as terminal electron acceptor.
4. Synthesis of ATP takes place by the process of chemiosmosis.
5. Synthesis of ATP is catalyzed by enzyme ATP synthase.

Complexes involved in ETS:

1. Complex I – NADH dehydrogenase
2. Complex II – Succinate dehydrogenase
3. Complex III – Cytochrome bc1
4. Complex IV – Cytochrome c oxidase
5. ATP synthase is also considered as complex V.