Question

In electron transport, each of the following respiratory complexes is involved in the flow of electrons from FADH2 to O2 except

-complex IV.
-complex I.
-complex II.
-complex III.
-All are involved in the flow of electrons from FADH2.

Answer 1

Complex II is involved in the flow of electrons from FADH2 to O2 in electron transport, bypassing Complex I and producing fewer ATP molecules.

Step-by-step explanation:

Electrons from FADH2 enter the Electron Transport Chain (ETC) at Complex II before proceeding to Complexes III and IV. Complex II receives electrons from the oxidation of FADH₂ to FAD, bypassing Complex I. This results in fewer ATP molecules being made from the FADH2 electrons, compared to NADH electrons. All the other mentioned respiratory complexes (Complexes I, III, and IV) are involved in the flow of electrons from FADH2 to O2 in the ETC.