4. The electron transfer chain involves four complexes that each facilitates a c

Question

4. The electron transfer chain involves four complexes that each facilitates a cascade of electron transfers via Redox reactions. a. Identify the substrate (material carrying electrons into complex), electron transfer int metal ions) and products that carry electrons away from each complex. Complex Carries e In Transfer Intermediates Carries e Out IV b.In which complex is the elemental oxygen wilized c. Write a balanced equation for the reaction using oxygen. d. Suggest a reason why nature would use such a complex sequence of energy transfers.

Explanation / Answer

complex                carries electrons in                  transfer intermediates carries electrons out

I                            NADPH                                        FMNH2                                       ubiquinol

II                           Succinate    FADH 2                                      ubiquinol

III                          ubiquinol    ubiquinone, cytochrome b, cytochrome c1         cytochrome c

IV cytochrome c copper and cytochromes binuclear centers,      oxygen

   tyrosyl radicle                                                                

b. complex IV passes on the electrons to oxygen to yield water

c. 4 Fe2+-cytochrome c + 8 H+in + O2 4 Fe3+-cytochrome c + 2 H2O + 4 H+out

d. This is ti build up the proton gradient across the intermembrane which is used to generate ATPs using complex V ATP synthase.

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.