2. If 22 acetyl groups enter the top of the TCA cycle and are completely catabol

Question

2. If 22 acetyl groups enter the top of the TCA cycle and are completely catabolized
than all of the following are true EXCEPT?
a. 44 ATP are generated via substrate-level phosphorylation in the turns of the TCA cycle.
b. 22 FADH2 molecules are generated from the turns of the TCA cycle.
c. The reducing power generated from the TCA cycle is enough to pump 792 H+.
d. 66 NADH molecules are generated from the turns of the TCA cycle.

3. Which combination of reducing power can contribute the most to the proton motive force? [*Assume that the system is an aerobically respiring yeast cell.]
a. The reducing power produced when two pyruvate molecules are converted to 2 molecules of acetyl-CoA + the reducing power generated in one turn of the TCA cycle.
b. The reducing power produced when one molecule of glucose is converted to 2 molecules of pyruvate in the Embden-Meyerhoff pathway (glycolysis)+ the reducing power produced when one pyruvate molecule is converted to 1 molecule of acetyl-CoA.
c. The reducing power produced when one molecule of glucose is converted to 2 molecules of pyruvate in the Embden-Meyerhoff pathway (glycolysis)+ the reducing power generated in one turn of the TCA cycle.

Explanation / Answer

1-uploaded image
On a Saturday morning, Josh sits reading the morning paper and eating donuts.
He begins to ponder the fact that carbohydrates are not the only macromolecule
that can be used to fuel energy needs in organisms. Fats can also be catabolized.
The reaction shown below is the first step of a spiral pathway that degrades fats.
Based on his knowledge of enzyme names, Josh immediately realizes that the
likely name of this enzyme is?
a. enoyl CoA kinase
b. acyl-CoA dehydrogenase
c. FADH2 isomerase
d. ATP synthase

2. If 22 acetyl groups enter the top of the TCA cycle and are completely catabolized
than all of the following are true EXCEPT?
a. 44 ATP are generated via substrate-level phosphorylation in the turns of the TCA cycle.
b. 22 FADH2 molecules are generated from the turns of the TCA cycle.
c. The reducing power generated from the TCA cycle is enough to pump 792 H+.
d. 66 NADH molecules are generated from the turns of the TCA cycle.

3. Which combination of reducing power can contribute the most to the proton motive force? [*Assume that the system is an aerobically respiring yeast cell.]
a. The reducing power produced when two pyruvate molecules are converted to 2 molecules of acetyl-CoA + the reducing power generated in one turn of the TCA cycle.
b. The reducing power produced when one molecule of glucose is converted to 2 molecules of pyruvate in the Embden-Meyerhoff pathway (glycolysis)+ the reducing power produced when one pyruvate molecule is converted to 1 molecule of acetyl-CoA.
c. The reducing power produced when one molecule of glucose is converted to 2 molecules of pyruvate in the Embden-Meyerhoff pathway (glycolysis)+ the reducing power generated in one turn of the TCA cycle.

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