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Quiz Chapter 7: Cellular Respiration

10 questions · Form 4 Biology Bab 6: Cellular Respiration

10 questions · plays in fullscreen

Full Question List & Answer Key

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

1. 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.

2. 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.

3. During bread making, what causes dough to rise and expand before baking?

  1. A. Ethanol evaporation
  2. B. Carbon dioxide bubbles released during yeast alcohol fermentation
  3. C. Lactic acid accumulation
  4. D. Absorption of atmospheric oxygen
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Answer: B

Carbon dioxide gas produced by yeast during alcohol fermentation gets trapped inside the dough, causing it to swell and rise.

4. Why is energy release in fermentation much lower than in aerobic respiration?

  1. A. Glucose is only partially oxidized, leaving energy stored in end products like ethanol or lactic acid.
  2. B. Enzymes in cytoplasm destroy ATP.
  3. C. Fermentation requires extra ATP input.
  4. D. Carbon dioxide absorbs the chemical energy.
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Answer: A

In fermentation, glucose is incompletely broken down, so most of its chemical energy remains locked inside ethanol or lactic acid molecules.

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. 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.

7. What happens to the remaining 56 of accumulated lactic acid in the liver after the oxygen debt has been paid?

  1. A. Excreted directly through urine.
  2. B. Converted back into glucose and stored as glycogen.
  3. C. Converted into carbon dioxide and exhaled.
  4. D. Transformed into amino acids.
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Answer: B

During recovery, 56 of the lactic acid in the liver is converted back into glucose using energy, then stored as glycogen.

8. How do paddy plants growing in flooded waterlogged fields survive temporary periods of low oxygen levels in soil?

  1. A. They perform lactic acid fermentation.
  2. B. They perform alcohol fermentation and tolerate high ethanol levels using alcohol dehydrogenase enzymes.
  3. C. They stop respiration completely.
  4. D. They absorb oxygen directly through root tubers.
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Answer: B

Paddy plant cells can undergo alcohol fermentation in flooded conditions and produce alcohol dehydrogenase to break down toxic ethanol.

9. Which organism undergoes lactic acid fermentation during the production of yogurt from milk?

  1. A. Saccharomyces cerevisiae
  2. B. Lactobacillus bacteria
  3. C. Amoeba proteus
  4. D. Escherichia coli
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Answer: B

Lactobacillus bacteria convert lactose sugar in milk into lactic acid, causing milk to curdle into yogurt.

10. Which cellular organelle is essential for carrying out the Krebs cycle and electron transport chain in aerobic respiration?

  1. A. Chloroplast
  2. B. Golgi apparatus
  3. C. Mitochondrion
  4. D. Endoplasmic reticulum
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Answer: C

Mitochondria are the powerhouse organelles where aerobic stages (Krebs cycle and Electron Transport Chain) take place.

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