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Quiz Chapter 7: Cellular Respiration

10 questions ยท Form 4 Biology Bab 6: Cellular Respiration

Question 1 of 10Score: 0

Which step is common to BOTH aerobic respiration and anaerobic fermentation pathways?

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Which step is common to BOTH aerobic respiration and anaerobic fermentation pathways?

  1. A. Krebs cycle
  2. B. Electron transport chain
  3. C. Glycolysis
  4. D. Oxidation of pyruvate
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Answer: C

Glycolysis is the initial universal pathway in cellular respiration that occurs in both aerobic respiration and fermentation.

2. What role does oxygen play during the final stage of aerobic cellular respiration in mitochondria?

  1. A. It acts as the final electron acceptor to form water.
  2. B. It splits glucose into pyruvate.
  3. C. It converts lactic acid into glycogen.
  4. D. It catalyzes the synthesis of ATP during glycolysis.
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Answer: A

In the electron transport chain, oxygen acts as the final electron acceptor, combining with protons (H+) to form water.

3. How many ATP molecules are produced per glucose molecule during fermentation?

  1. A. 2 ATP
  2. B. 12 ATP
  3. C. 32 ATP
  4. D. 38 ATP
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Answer: A

Because glucose is only partially broken down in fermentation, only 2 ATP molecules are produced during the glycolysis step.

4. Where in the eukaryotic cell does the glycolysis pathway take place?

  1. A. Mitochondrial matrix
  2. B. Cytoplasm
  3. C. Inner mitochondrial membrane
  4. D. Ribosome
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Answer: B

Glycolysis is the initial step of glucose breakdown that occurs exclusively in the cytoplasm and does not require oxygen.

5. Why do human skeletal muscle cells experience fatigue and muscle cramps during strenuous physical activity?

  1. A. Excess oxygen builds up in muscle fibers.
  2. B. Rapid accumulation of lactic acid from anaerobic respiration.
  3. C. Depletion of ethanol in the cytoplasm.
  4. D. Overproduction of carbon dioxide gas inside mitochondria.
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Answer: B

Under oxygen deficit, muscle cells perform lactic acid fermentation; accumulated lactic acid lowers pH and causes muscle cramps and fatigue.

6. What is the primary organic substrate utilized by living cells to initiate cellular respiration?

  1. A. Fatty acids
  2. B. Glucose
  3. C. Amino acids
  4. D. Lactose
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Answer: B

Glucose is the main respiratory substrate derived from carbohydrate breakdown used by cells to yield ATP.

7. Which set of end products is produced during alcohol fermentation in yeast cells?

  1. A. Lactic acid + 2 ATP
  2. B. Ethanol + Carbon dioxide + 2 ATP
  3. C. Carbon dioxide + Water + 38 ATP
  4. D. Pyruvate + Oxygen + 2 ATP
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Answer: B

Yeast decomposes glucose incompletely into ethanol, carbon dioxide, and 2 ATP molecules during alcohol fermentation.

8. Which of the following equations accurately summarizes lactic acid fermentation in human muscle cells?

  1. A. Glucose -> Ethanol + CO2 + 2 ATP
  2. B. Glucose -> Lactic Acid + 2 ATP
  3. C. Glucose + Oxygen -> CO2 + H2O + 38 ATP
  4. D. Pyruvate + Oxygen -> Lactic Acid + CO2
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Answer: B

Lactic acid fermentation converts glucose directly into 2 molecules of lactic acid and a net total of 2 ATP.

9. During glycolysis, one 6-carbon molecule of glucose is broken down into two molecules of which 3-carbon compound?

  1. A. Acetyl-CoA
  2. B. Pyruvate
  3. C. Ethanol
  4. D. Lactic acid
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Answer: B

Glycolysis splits glucose (6C) into two molecules of pyruvate (3C).

10. What structural feature of inner mitochondrial membranes maximizes ATP synthesis during aerobic respiration?

  1. A. Thick smooth surface
  2. B. Highly folded cristae to increase surface area for electron transport chains
  3. C. Pores for sucrose entry
  4. D. Double-layer cellulose coating
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Answer: B

The inner mitochondrial membrane has numerous folds (cristae) that increase the surface area for electron transport enzymes and ATP synthase.

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