3. The final output of the Krebs cycle includes all of the following except? a. NADP b. FADH2 c. ATP d. CO2
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1 Laura Tucker Bio 212 SI Cellular Respiration 1. What are the four steps of cellular respiration? a. b. c. d. 2. The end product of glycolysis is? a. NADH b. Acetyl CoA c. Lactate d. Pyruvate 3. The final output of the Krebs cycle includes all of the following except? a. NADP b. FADH2 c. ATP d. CO2 4. The usefulness of fermentation as a means of deriving energy is limited because a. It cannot generate enough ATP b. It produces too much NH2 c. The end products are toxic to the producer d. It uses more energy than it produces 5. Which of the following is not a product of fermentation? a. CO2 b. O2 c. Ethanol d. Lactate e. All of the above
2 6. What substance is produced by the oxidation of pyruvate and feeds into the citric acid cycle? a. Pyruvate b. Glucose c. acetyl CoA d. O2 e. CO2 7. What role does O2 play in aerobic respiration? a. It plays no role b. It combines with acetyl CoA at the start of krebs cycle c. It is given off as a by product during the oxidation of pyruvate d. It combines with H2O to help drive the formation of ATP e. It is the final electron acceptor at the end of the electron transport chain f. 8. Oxidizing which of the following substances yields the most energy? a. Proteins b. Glucose c. Fatty acid d. Alcohol e. Water 9. The oxidation of glucose to two molecules each of pyruvate, ATP, and NADh is called and occurs in the. a. Glycolysis: cytoplasm b. Fermentation: cytoplasm c. Krebs cycle: mitochondria d. Glycolysis: mitochondria e. Fermentation: mitochondria 10. A cell was cultured with radioactive labeled O2. The cells were monitored. In a few minutes that radioactive oxygen atoms were present in which of the following compounds:
3 a. Carbon dioxide b. NADH and FADH2 c. Water d. ATP e. Lactic acid 11. Under normal conditions, as electrons flow down the electron transport chain of the mitochondria? a. NADH and FAdH2 are oxidized b. The ph of the matrix increases c. The electron lose free energy d. The electrochemical gradient is formed e. All of the above 12. Pyruvate is oxidized when oxygen is present a. True b. False 13. Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed? a. Pyruvate (present) oxygen (present) ATP levels (high) b. Pyruvate (present) oxygen (present) ATP levels (low) c. Pyruvate (present) oxygen (absent) ATP levels (high) d. Pyruvate (absent) oxygen (present) ATP levels (hlow) e. Pyruvate (absent) oxygen (absent) ATP levels (high) 14. What is the effect of increased levels of hydrogen ions in the intermembrane space? a. Decreased levels of oxidative phosphorylation b. Increased levels of water in intermembrane space c. Decreased levels of chemiosmosis d. Increased ATP production
4 15. Predict the outcome of a mitochondrial membrane that is more permeable to hydrogen ions than normal? a. Reduced activity of electron transport chain b. Reduced formation of water c. Increased levels of inorganic phosphate in the mitochondrial matrix d. Increased activity of ATP synthase 16. What would occur if all available hydrogen ions were used by ATP sythase a. Decrease levels of inorganic phosphate in intermembrane space b. Increase levels of inorganic phosphate in mitochondrial matrix c. Increase the ph of mitochondrial matrix d. Increase ph of mitochondrial intermembrane space
5 Answer key 17. What are the four steps of cellular respiration? a. Glycolysis b. Pyruvate c. Krebs Cycle d. Oxidative phosphorylation 18. The end product of glycolysis is? a. NADH b. Acetyl CoA c. Lactate d. Pyruvate 19. The final output of the Krebs cycle includes all of the following except? a. NADP b. FADH2 c. ATP d. CO2 20. The usefulness of fermentation as a means of deriving energy is limited because a. It cannot generate enough ATP b. It produces too much NH2 c. The end products are toxic to the producer d. It uses more energy than it produces 21. Which of the following is not a product of fermentation? a. CO2 b. O2 c. Ethanol d. Lactate e. All of the above
6 22. What substance is produced by the oxidation of pyruvate and feeds into the citric acid cycle? a. Pyruvate b. Glucose c. acetyl CoA d. O2 e. CO2 23. What role does O2 play in aerobic respiration? a. It plays no role b. It combines with acetyl CoA at the start of krebs cycle c. It is given off as a by product during the oxidation of pyruvate d. It combines with H2O to help drive the formation of ATP e. It is the final electron acceptor at the end of the electron transport chain 24. Oxidizing which of the following substances yields the most energy? a. Proteins b. Glucose c. Fatty acid d. Alcohol e. Water 25. The oxidation of glucose to two molecules each of pyruvate, ATP, and NADh is called and occurs in the. a. Glycolysis: cytoplasm b. Fermentation: cytoplasm c. Krebs cycle: mitochondria d. Glycolysis: mitochondria e. Fermentation: mitochondria 26. A cell was cultured with radioactive labeled O2. The cells were monitored. In a few minutes that radioactive oxygen atoms were present in which of the following compounds:
7 a. Carbon dioxide b. NADH and FADH2 c. Water d. ATP e. Lactic acid 27. Under normal conditions, as electrons flow down the electron transport chain of the mitochondria? a. NADH and FAdH2 are oxidized b. The ph of the matrix increases c. The electron lose free energy d. The electrochemical gradient is formed e. All of the above 28. Pyruvate is oxidized when oxygen is present a. True b. False 29. Under which condition would you expect the mitochondrial proton gradient to be highest and therefore ATP synthesis to proceed? a. Pyruvate (present) oxygen (present) ATP levels (high) b. Pyruvate (present) oxygen (present) ATP levels (low) c. Pyruvate (present) oxygen (absent) ATP levels (high) d. Pyruvate (absent) oxygen (present) ATP levels (hlow) e. Pyruvate (absent) oxygen (absent) ATP levels (high) 30. What is the effect of increased levels of hydrogen ions in the intermembrane space? a. Decreased levels of oxidative phosphorylation b. Increased levels of water in intermembrane space c. Decreased levels of chemiosmosis d. Increased ATP production
8 31. Predict the outcome of a mitochondrial membrane that is more permeable to hydrogen ions than normal? a. Reduced activity of electron transport chain b. Reduced formation of water c. Increased levels of inorganic phosphate in the mitochondrial matrix d. Increased activity of ATP synthase 32. What would occur if all available hydrogen ions were used by ATP sythase a. Decrease levels of inorganic phosphate in intermembrane space b. Increase levels of inorganic phosphate in mitochondrial matrix c. Increase the ph of mitochondrial matrix d. Increase ph of mitochondrial intermembrane space
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