Aerobic cell respiration requires oxygen, but at the same time, produces much more ATP than anaerobic respiration. In the process, pyruvate is converted into water and carbon dioxide through a metabolic chain, and during this conversion, ADP is turned into ATP.
DBQ P92
1
- The base is needed to absorb a waste product, carbon dioxide. Without the base, the amount of carbon dioxide given off cannot be measured.
2
- The fluid will move from the right hand side to the left hand side. This is because the air pumped by the syringe will go through the tube from the right hand side. The readings will go up as more oxygen is consumed.
3
- During the experiment, nitrogen concentration will increase due to the consumption of oxygen during aerobic respiration. There will be less oxygen, so therefore nitrogen concentration will be higher.
4a
- By placing the test tube in a thermostatically controlled water bath, the temperature will be controlled. If we keep the temperature of the tube close to the body temperature of the animal, the experiment will be more realistic since the environment will be more similar. Also, reaction is highly dependent on temperature so it is good to keep the temperature a controlled variable.
4b
- This process will make the results more reliable because it will control the pressure of the entire experiment. With an open end, the pressure outside the tube can highly effect the readings since pressure can cause fluctuation in the capillary tube. Therefore, keeping the pressure constant will make the results more reliable.
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