Biology Lab Practice Questions With Answers (Set 03)

Questions
1. In Table 5.1, page 1, which tube is a negative control?
2. If this tube showed bubbling what, what could you conclude about the procedure?
3. In the experiment Carbon Dioxide Uptake (page 5), blowing onto the solution adds what gas to the test tube?
4. In the experiment Carbon Dioxide Uptake (page 5, question 6), why did the solution eventually turned red.
5. In Experiment Cellular Respiration, (page 7), why is it necessary to absorb carbon dioxide?
6. In Experiment Cellular Respiration, (page 7), which respirometer was a negative control (1, 2 or 3)?
7. What happens at the active site of an enzyme?
8. On the basis of the active site, explain why adding more enzyme speeds up a chemical reaction?
9. On the basis of the active site, explain why adding more substrate speeds up a chemical reaction?
10. Name three conditions (other than adding more enzyme or more substrate) that can maximize the activity of an enzyme.
11. In question 5, page 8, which tube would show digestion following an incubation at 37C? Explain why.
12. Fats are digested to fatty acids and glycerol. As the reaction described in question 5, page 8 proceeds, the solution will become of what type of pH (acidic, neutral or basic)? Explain why.
13. Given the reaction catalyzed by catalase (see page 8, question 7), which substance is the substrate?
14. Given the reaction catalyzed by catalase (see page 8, question 7), which substance is the enzyme?
15. Given the reaction catalyzed by catalase (see page 8, question 7), which substance(s) is/are the end product(s)?
16. Given the reaction catalyzed by catalase (see page 8, question 7), is this a synthetic or degradative reaction?
17. How are plant pigments involved in photosynthesis?
18. Why is it beneficial to have several different plant pigments involved in photosynthesis?
19. On what basis does chromatography separate substances?
20. Given the carbonic acid reaction shown on page 9, and given that phenol red (a pH indicator, turns yellow in acidic solution) explain why the test tube turns yellow when you blow air in it.
21. When light is available and a plant is added to a yellow test tube, the solution returns to its original red color. Why does this occur?
22. Which cellular organelle is involved in photosynthesis?
23. Which cellular organelle is involved in cellular respiration?
24. Which gas is given off during photosynthesis?
25. Which gas is given off during cellular respiration?
26. Which gas is taken up during photosynthesis?
27. Which gas is taken up during cellular respiration?
28. What experimental conditions were used in this laboratory to test only for cellular respiration in photosynthesizing Elodea cells?
29. In the experimental Procedure: Cellular Respiration, what gas was taken up by soybeans?
30. Explain the role of KOH in the cellular respiration experiment.

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