Which of the Following is the Common Product Produced by Complex

Question

Which of the following is the common product produced by Complex I and Complex II?
A)FAD
B)reduced coenzyme Q
C)NAD⁺
D)reduced O₂

Accepted Answer

Both Complex I and Complex II transfer electrons to coenzyme Q (CoQ), which becomes reduced (QH2) and can then transfer those electrons to Complex III in the electron transport chain. None of the other options (FAD, NAD⁺, reduced O₂) are products of Complex I or II.