Flavoproteins are component of which complex of respiratory chain:
Flavoproteins are impoant components of Complexes I and II. The oxidized flavin nucleotide (FMN or FAD) can be reduced in reactions involving the transfer of two electrons (to form FMNH2 or FADH2), but they can also accept one electron to form the semiquinone. Ref: Harper 28th edition, chapter 13.
Complex I
Complex II
Both of the above
None of the above