Question #1: Which of the following pairs of redox molecules is NOT in the prope
ID: 59377 • Letter: Q
Question
Question #1: Which of the following pairs of redox molecules is NOT in the proper order of lower to higher reduction potential?
a.) FAD then Fe-S from Complex I
b.) FMN then Fe-S from Complex I
c.) Cyt c then Cyt a
d.) Cyt a3 then oxygen
e.) all are correct
Question #2: Put the following components of the electron transport chain in order.
a.) cytochrome c
b.) coenzyme Q
c.) oxygen
d.) Fe-S cluster from Complex I
e.) flavin mononucleotide
Question #3:Which of these processes results in depletion of protons in the matrix and buildup of protons in the intermembrane space of the mitochondrion?
a.) Oxidation of NADH by FMN and subsequent reduction of the Fe-S cluster of complex I.
b.) Direct oxidation of NADH by the Fe-S cluster in complex I.
c.) Formation of oxygen in the matrix.
d.) Oxidation of FADH2 by CoQ.
e.) Both a and d.
Question #4: How many moles of ATP will you get for 1 mole of FADH2 that is reoxidized by the electron transport chain? Please give only a number.
Question #5:Which of these accurately describe the oxidized Fe-S cluster from Complex II in the ETC?
a.) It is responsible for oxidizing FADH2
b.) It is responsible for reducing CoenzymeQ
c.) It will not accept protons resulting in protons being left in the matrix
d.) Both a and c
e.) All of the above
Explanation / Answer
1. Cyt a has lower redox potential than Cyt c. Option c is correct.
2. Flavin mononucleotide (FMN) --- Fe-S cluster from Complex I ---- coenzyme Q ---- cytochrome c ----- oxygen.
Hence the order os e - d - b- a - c is correct.
3. Oxidation of NADH by FMN and subsequent reduction of the Fe-S cluster of complex I results in depletion of protons in the matrix and buildup of protons in the intermembrane space of the mitochondrion. Option a is correct. This is because the NADH oxidation results in movement of protons into mitochondrial inner membrane uphill the proton concentration gradient and generated proton motive force.
4. 1 mole of FADH2 produces 2 moles of ATP.
5. Oxidized Fe-S cluster from Complex II in the ETC is responsible for reducing CoenzymeQ. Option b is correct.