Respuesta :
Inside of complex 1, fmnh2 transfers electrons to an fe/s complex. when this reaction occurs, FMNH, gets oxidized. So, the correct option is (c).
Either complex I or II is where electrons can enter the electron transport chain. The NADH, which is created in three processes of the citric acid cycle, is where these electrons originate from. As an illustration, consider the reaction in step 8 where NAD+ is reduced to NADH and L-malate is oxidized to oxaloacetate. Two hydrogen (H+) ions and two electrons are taken away from the substrate in the oxidation half-reaction.
The NAD+ molecule takes both of those electrons as well as one of the H+ ions during the reduction half-reaction. The inner mitochondrial membrane, the intermembrane space, and the other H+ ion are all traversed by the other H+ ion from the matrix. Through the matrix, NADH diffuses before being bound by complex I of the electron transport chain.
Complex I of the electron transport chain binds NADH as it diffuses across the matrix. The coenzyme flavin mononucleotide (FMN) in the complex takes both of NADH's electrons. By transferring the electrons, FMN is reduced to FMNH2 (reduced form of flavin) and NADH is oxidized back to NAD+.
Several proteins in Complex I have iron-sulfur (FeS) centers. These proteins are now receiving the electrons that were used to convert FMN to FMNH2.Two Fe-S centers are required to accept the two electrons required to regenerate FMN mononucleotide since each Fe-S center can only transmit one electron.
Learn more about electron transport chain here;
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