Q3.1. Yeast have mitochondria and can perform cellular respiration. What would you expect to be consumed and produced during the process of cellular respiration in yeast? a. Glucose and O2 consumed; CO2, H2O, and energy produced. b. Glucose, H2O, CO2, and energy consumed; O2 produced. c. CO2 and H2O consumed; glucose, O2, and energy produced. d. CO2 and energy consumed; H2O, O2, and energy produced. Q3.2. In which way do cells use glucose during the production of ATP? a. Cells incorporate some of the atoms from glucose molecules into ATP molecules. b. Cells convert glucose molecules entirely into energy, which is then stored in ATP. c. Cells transfer some of the energy stored in glucose’s chemical bonds to ATP. d. Cells directly combine glucose with O2 in the ETC to produce energy for ATP. Q3.3. Recall that in cellular respiration, the processes of glycolysis, pyruvate processing, and the citric acid cycle precede the electron transport chain. What is produced by these three prior processes that is used by the electron transport chain? (Hint: Click here to see an overview of the major processes in cellular respiration.) a. Each of the three processes produce ATP, which carries potential energy to the ETC. b. Each of the three processes produce protons that the ETC pumps into the intermembrane space. c. Each of the three processes produce NADH, which carries potential energy to the ETC. d. Each of the three processes produce FADH2, which carries potential energy to the ETC. Q3.4. Complex I transfers electrons to Q (coenzyme Q) in one of the reactions in the electron transport chain. Which molecule is reduced and which is oxidized in this reaction? a. Complex I is reduced because it loses electrons and Q is oxidized because it gains electrons. b. Complex I is oxidized because it loses electrons and Q is reduced because it gains electrons. c. Complex I is reduced because it gains electrons and Q is oxidized because it loses electrons. d. Complex I and Q are both oxidized because electrons are moved from one molecule to the other. Q3.5. Which of the following does NOT store potential energy that is usable by a cell? ATPProtons pumped into the intermembrane spaceNADHCO2 Q3.6. Some students have the misconception that during cellular respiration, the matter in glucose is somehow turned into energy. Consider that when we exercise, we burn glucose and also lose mass. Why does this happen? a. Our cells use up the potential energy stored in glucose, and losing that energy during exercise reduces our mass. b. Our cells convert the mass in glucose into energy, which is weightless. c. Our cells convert the mass in glucose into energy that is used during exercise. Losing that energy reduces our mass. d. Our cells convert glucose into CO2 and water, which are eliminated from our bodies when we exercise. Q3.7. Which of the following would INCREASE the number of ATP molecules generated per NADH molecule in the electron transport chain? a. Reversing the direction of proton pumping by Complex I b. Reducing the number of protons required by ATP synthase to produce an ATP molecule c. Having NADH transfer its electrons to Complex III instead of Complex I d. Reducing the amount of oxygen available to the cell 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? a. Lack of oxygen (electrons don’t leave the ETC) b. Presence of DNP (protons leak through the membrane) c. Starvation (lack of glucose) d. Intense exercise (high ATP utilization) Q3.9. For which of the following is potential energy INCREASING? (Hint: Click here to see an overview of the ETC.) a. Protons moving from the mitochondrial matrix to the intermembrane space b. Electrons moving from Complex IV to O2 c. Protons moving from the intermembrane space to the mitochondrial matrix d. Electrons moving from Complex III to Complex IV Q3.10. What would happen to you, metabolically, if all your mitochondria were destroyed? a. You would have much less ATP available to think, move muscles, etc. b. You would have many fewer electrons available to think, move muscles, etc. c. You would have much less oxygen available to think, move muscles, etc. d. You would have much less glucose available to think, move muscles, etc.
