Question

FMN is component of

• A. complex I
• B. complex II
• C. complex III
• D. complex IV

Answer 1

The correct option is A complex I

The inner mitochondrial membrane has five complexes. Four complexes are involved with transfer of electrons released from $NADH+H^{+}$ and $FAD{H}_2$ and complex V is involved with the synthesis of ATP.

Flavin mononucleotide (FMN) is a component of complex (NADH dehydrogenase complex). $NADH+H^{+}$ binds to complex I and gets oxidised releasing electrons which are transferred to FMN of complex I. From FMN, electrons pass via a lot of electron acceptors and finally are accepted by oxygen which is the terminal acceptor of electrons. The energy present in these electrons is used to generate ATP.