Cellular Respiration Explored NOTES Q3.7. Which of the following would INCREA SE
ID: 278148 • Letter: C
Question
Cellular Respiration Explored NOTES Q3.7. Which of the following would INCREA SE the number of ATP molecules NADH molecule in the electron transport chain? O Reversing the direction of proton pumping by Complex I Reducing the number of protons required by ATP synthase to produce an ATP molecule o Having NADH transfer its electrons to Complex ill instead of Complex I Reducing the amount of oxygen available to the cell oli Q3.8. The antibiotic antimycin A causes electrons to become stuck to Q, so that they are unable to ever reach Complex IV. Which of the following scenarios you explored in this tutorial is MOST SIMILAR to the effects of antimycin A? O Lack of oxygen (electrons don't leave the ETC) O Presence of DNP (protons leak through the membrane) O Starvation (lack of glucose) O Intense exercise (high ATP utilization) eel nto Q3.9. For which of the following is potential energy DECREA SING? (Hint: Click hereto see an overview of the ETC.)Explanation / Answer
37. Ans: reducing the number of proteons required by ATP synthase to produce an ATP molecule.
The yield of ATP molecules generated by ATP synthase can be estimated from the number of protons moved out of the matrix into the inter membrane space during oxidation of NADH. An NADH oxidation requires 10 protons to move from the matrix to inter membrane space. Thus if the required number of protons is less, more number of ATP would have been generated per NADH.
38. Presence of DNP (2,4-dinitrophenol). It is a weak acid that uncouples mitochondrial respiration and oxidative phosphorylation. It acts as an ionophore transporting protons across the inner membrane and nullifies the proton gradient created by electron transport along the respiratory chain. Thus it inhibits the synthesis of ATP by ATP synthase.
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