Question

In a cell, why must NADH be reoxidized? How does this happen in an organism that uses respiration? Fermentation? 2. Explain the chemiosmotic mechanism of ATP generation. How does oxidative phosphorylation compare with substrate level phosphorylation found in glycolysis and the Kreb’s cycle? 3. Which of the following yields the greatest energy for a cell: fermentation, anaerobic respiration, or aerobic respiration? Which yields the least? Why? 4. Explain what happens to glucose during glycolysis and respiration in terms of oxidation and reduction.

Answer 1

1. NADH must be reoxidised for the production of energy in ETC and for the production of lactate in fermentation.

2. Movement of proton ions through the ATP synthase would give the potential energy to add the phosphate molecule into ADP to synthesise the ATP is called as chemiosmosis.

3. Aerobic respiration gives 38 moles of ATP and anaerobic gives 2 moles of ATP per glucose molecule.

4. Glucose molecule is converted into pyruvate at the end of the glycolysis and the pyruvate is converted into carbondioxide at the end of the TCA cycle.