Use the following figure to answer the questions below.

-Which of the protein complexes labelled with Roman numerals in the figure above will transfer electrons to O₂?
A)complex I
B)complex II
C)complex III
D)complex IV
E)All of the complexes can transfer electrons to O₂.

Question

Use the following figure to answer the questions below.
 
-Which of the protein complexes labelled with Roman numerals in the figure above will transfer electrons to O₂?
A)complex I 
B)complex II 
C)complex III 
D)complex IV 
E)All of the complexes can transfer electrons to O₂.

Quizplus · Accepted Answer

Complex IV (cytochrome c oxidase) is the protein complex that transfers electrons to O₂, reducing it to water. Complex I (NADH dehydrogenase), complex II (succinate dehydrogenase), and complex III (cytochrome bc1 complex) participate in the electron transport chain leading up to complex IV, but they do not directly transfer electrons to O₂.

Use the Following Figure to Answer the Questions Below