Aerobic Respiration Quiz
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5 questions, one answer each
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1. Which of the following is NOT a use of energy released during aerobic respiration in living organisms?
- A. Photosynthesis in plant cells
- B. Muscle contraction during movement
- C. Active transport across cell membranes
- D. Protein synthesis on ribosomes
2. A yeast culture is investigated to study the effect of temperature on respiration. At 10°C, the yeast respires slowly. As temperature increases to 40°C, the respiration rate increases. What happens to the respiration rate if the temperature is further increased to 60°C?
- A. The respiration rate continues to increase at the same rate
- B. The respiration rate decreases sharply because enzymes denature
- C. The respiration rate remains constant at its maximum
- D. The respiration rate increases slightly then levels off
3. Energy from aerobic respiration is used for growth in organisms. Which statement best explains how this energy is utilised during growth?
- A. Energy is used to break down glucose molecules only
- B. Energy is used to synthesise new proteins and build new cells
- C. Energy is released as heat to warm the organism
- D. Energy is stored directly in new body tissues without any processing
4. In an experiment, yeast cells are placed in two flasks at different temperatures. Flask A is kept at 25°C and Flask B at 35°C. Both flasks contain identical glucose solutions. After 30 minutes, which flask would show the greater consumption of glucose and why?
- A. Flask A, because lower temperatures preserve glucose
- B. Flask B, because enzyme activity is higher at a temperature closer to the yeast's optimum
- C. Both flasks equally, because temperature does not affect respiration rate
- D. Flask A, because enzymes work faster at cooler temperatures
5. Maintaining constant body temperature in mammals requires continuous energy expenditure. Which of the following best explains how aerobic respiration supports this process?
- A. Respiration produces glucose which is converted directly into heat
- B. Respiration in cells releases energy as ATP, which when used by cells produces heat as a byproduct
- C. Respiration only occurs in muscle cells to generate warmth through contraction
- D. Respiration slows down in cold environments to conserve heat