Question

1. When ONE molecule of glucose is totally oxidized to CO2 and H2O, how many net ATP molecules (or GTP equivalents) are made by oxidative phosphorylation, relative to the maximum yield?A. 30 out of 30

B. 12 out of 24

C. 26 out of 30

D. 4 out of 24

E. 4 out of 30

would the answer be E or C

2. The SEQUENCE OF THREE REACTIONS ( oxidation, hydration, and oxidation) occurs in which one(s)of the following pathways?

A. Citric Acid Cycle

B. Fatty acid Beta-Oxidation

C. glycolysis

D. citric acid cycle, and fatty acid beta-oxidation

E. glycolysis, citric acid cycle, and fatty acid beta-oxidation

3. How many NADH molecules are produced by the citric acid cycle per TWO molecules of glucouse?

A. 1

B. 3

C. 6

D. 9

E. 12

Answer 1

1. According to this balance sheet, the answer is 28. But there can be a difference of 2 to 3 ATP. So, option C will be correct.

2. E

Glycolysis is oxidation of glucose into two molecules of pyruvic acid.

Citric acid cycle is hydration of acetyl coenzyme a with oxalic acid to form citric acid and various other fatty after intermediates.

Beta oxidation is oxidation of fatty acid to acetyl coenzyme a which is further oxidised by citric acid cycle.

3. 6

One round of citric acid cycle produces three molecules of NADH, one molecule of FADH₂ and one molecule of GTP. You can see this from the above respiratory balance sheet. So two rounds will produce 6 molecules of NADH.

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