Question 4 Iron (Fe) and copper (Cu) ions, as well as the lipid Ubiquinone (a. Coenzyme Q or CoQ), participate in the transport of electrons through...

Question 4

1. Iron (Fe) and copper (Cu) ions, as well as the lipid Ubiquinone (a.k.a. Coenzyme Q or CoQ), participate in the transport of electrons through the mitochondrial electron transport system. Shown below are some of their standard reduction potentials. (Note that these reduction potentials are not necessarily the same as they are in a cellular context.)
2. Reaction
3. ε°' (V)
4. 2Fe3+ + 2e- à 2Fe2+
5. +1.52
6. 2Cu2+ + 2e- à 2Cu+
7. +0.30
8. CoQ + 2H+ + 2e-  à CoQH2
9. +0.04
10. Based on the information in the table and what we have learned in class regarding the electron transport system, which of the following could be reduced by (i.e. take electrons from) CoQ?
11. Fe3+
12. Cu2+
13. O2
14. All of the above
15. None of the above

0.5 points  

1. Which of the following is NOT part of the pathway for transfer of electrons from NADH through the ETS?
2. Complex I
3. Complex II
4. Complex IV
5. Ubiquinone/Coenzyme Q

0.5 points  

1. Phosphofructokinase (PFK-1) is one of the most regulated enzymes in metabolism. Which of the following would be expected to be an allosteric inhibitor of PFK-1?
2. Glucose
3. Fructose-6-phosphate
4. Acetyl CoA
5. AMP