Explaining the effect of temperature on the rate of cellular respiration

12 questions

1. What kind of cellular respiration is used to produce alcoholic drinks?
2. Bacteria that produce lactic acid when they respire are used in the production of yogurt from milk. What can you conclude about the amount of oxygen dissolved in milk?
3. The simple respirometer shown in the diagram is used to investigate the effect of temperature on the rate of cellular respiration. Match each variable to its correct example.
4. When using this type of respirometer, the water moves up the capillary tube because the pressure inside the test tube falls. Why does the pressure in the tube fall?
5. A student plans to use a respirometer to investigate the effect of temperature and amount of glucose on the rate of respiration. The investigation will not produce valid results. Why?
6. A student used the respirometer shown. After 5 minutes at 25 °C, the coloured water moved 8 mm towards tube A and 2 mm towards tube B. How many mm has the water moved because of cellular respiration?
7. The respirometer shown is used to measure the rate of respiration. What units would the rate of respiration be measured in?
8. The following table shows results from a respirometer experiment. What conclusion can be drawn from these results?
9. The following table shows results from a respirometer experiment. Which statement about the data is true?
10. Enzymes work as catalysts because the substrate precisely fits into part of the enzyme molecule called the active site. Scientists use the ___ and key model to describe this precise fit.
11. Which of these is the **best** explanation of why the rate of cellular respiration increases with temperature?
12. At 55 °C, the temperature is so high that it breaks bonds in the enzyme molecule, changing its 3D shape. The enzyme is ___ and no longer works.

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