Cellular Respiration Practice Exam

Multiple Choice Questions

1. What is the primary purpose of cellular respiration?

   A) To produce glucose

   b) To convert glucose into energy

   c) To consume oxygen

   d) To synthesize protein

2. Which of the following processes occurs in the mitochondria?

   a) Glycolysis

   b) Fermentation

   c) Krebs Cycle

   d) Electron Transport Chain

3. What is the end product of glycolysis?

   a) Acetyl-CoA

   b) Pyruvate

   c) Oxygen

   d) ATP

4. How many ATP molecules are produced from one molecule of glucose during cellular respiration?

   a) 2

   b) 30-32

   c) 38

   d) 4

5. In the absence of oxygen, cells can undergo which process?

   a) Oxidative phosphorylation

   b) Fermentation

   c) Krebs Cycle

   d) Glycolysis

6. During which phase of cellular respiration is carbon dioxide produced?

   a) Glycolysis

   b) Krebs Cycle

   c) Electron Transport Chain

   d) Fermentation

7. What is the function of NADH in cellular respiration?

   a) To donate electrons

   b) To consume glucose

   c) To produce ATP

   d) To digest proteins

8. Which of the following is a byproduct of cellular respiration?

   a) Glucose

   b) Oxygen

   c) Water

   d) Carbon Dioxide

9. How is ATP produced in glycolysis?

   a) Directly through substrate-level phosphorylation

   b) Through oxidative phosphorylation

   c) By ATP synthase

   d) From photosynthesis

10. Why is oxygen considered the final electron acceptor in aerobic respiration?

    a) It directly converts glucose into energy

    b) It forms water after receiving electrons

    c) It initiates glycolysis

    d) It is not needed in cellular respiration

11. Which high-energy molecule is produced during the Krebs Cycle?

    a) ATP

    b) NADH

    c) FADH2

    d) All of the above

12. What happens to pyruvate in the presence of oxygen?

    a) It is converted into lactic acid

    b) It enters the Krebs Cycle

    c) It is reduced to ethanol

    d) It is discarded by the cell

13. Which statement correctly describes the relationship between photosynthesis and cellular respiration?

    a) They are identical processes

    b) Photosynthesis occurs in animals, while respiration occurs in plants

    c) The products of photosynthesis are the reactants of respiration

    d) Photosynthesis requires oxygen, while respiration does not

14. During which part of cellular respiration is the majority of ATP generated?

    a) Glycolysis

    b) Krebs Cycle

    c) Electron Transport Chain

    d) Fermentation

15. Which of the following factors can affect the rate of cellular respiration?

    a) Temperature

    b) Availability of substrates (glucose)

    c) The presence of enzymes

    d) All of the above

16. What is the role of the electron transport chain in cellular respiration?

    a) To produce glucose

    b) To generate ATP using the energy from electrons

    c) To convert pyruvate into acetyl-CoA

    d) To synthesize NADH

17. In which step of cellular respiration is substrate-level phosphorylation utilized?

    a) Glycolysis

    b) Krebs Cycle

    c) Electron Transport Chain

    d) All of the above

18. What is produced when lactic acid fermentation occurs in muscle cells?

    a) Ethanol

    b) Glucose

    c) Lactic acid

    d) Oxygen

19. What molecule starts the Krebs Cycle?

    a) Glucose

    b) Acetyl-CoA

    c) Pyruvate

    d) NADH

20. Which of these organisms can perform anaerobic respiration?

    a) Humans

    b) Yeast

    c) Plants

    d) All of the above

21. What would happen to ATP production if cells lacked oxygen?

    a) ATP production would stop completely

    b) Cells would switch to aerobic respiration

    c) ATP production would remain the same

    d) ATP production would increase

22. What kind of organisms only perform fermentation?

    a) Aerobic organisms

    b) Anaerobic organisms

    c) Eukaryotic organisms

    d) Photosynthetic organisms

23. Which molecule acts as a coenzyme in the Krebs Cycle?

    a) NADH

    b) FAD

    c) Coenzyme A

    d) All of the above

24. In aerobic respiration, the majority of ATP is produced during:

    a) Glycolysis

    b) Krebs Cycle

    c) Electron Transport Chain

    d) Fermentation

25. The reactions of the Krebs Cycle occur in the:

    a) Cytoplasm

    b) Nucleus

    c) Mitochondrial matrix

    d) Cell membrane

Short Answer Questions

26. Describe the three main stages of cellular respiration.

27. What role does oxygen play in cellular respiration?

28. Explain how ATP is produced during the Electron Transport Chain.

29. What are the differences between aerobic and anaerobic respiration?

30. Why is fermentation important to cells in low oxygen environments?

31. How does the removal of carbon dioxide from the atmosphere affect cellular respiration?

32. Describe how cellular respiration is regulated in the body.

33. What adaptations do certain organisms have to survive in anaerobic environments?

Essay Questions

34. Discuss the impact of cellular respiration on overall metabolism and energy production in cells.

35. Analyze the efficiency of cellular respiration and factors that can affect ATP yield.

36. Evaluate the importance of cellular respiration in different organisms, comparing aerobic and anaerobic pathways.

37. How do environmental factors, such as temperature and pH, affect the rate of cellular respiration?

38. Explore the relationship between cellular respiration and exercise performance in humans.

39. Discuss the consequences of disrupted cellular respiration on cellular function and overall health.

40. Compare and contrast the pathways of energy production in cellular respiration and photosynthesis.

Answers

Answer Key

1. b

2. c, d

3. b

4. b

5. b

6. b

7. a

8. c, d

9. a

10. b

11. d

12. b

13. c

14. c

15. d

16. b

17. d

18. c

19. b

20. b

21. a

22. b

23. d

24. c

25. c