Cellular Respiration Investigation
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Cellular Respiration Investigation
Investigation brief
Each flask contained 20 mL of 5% yeast suspension. The team added 20 mL of glucose solution at one of three concentrations: 0%, 2.5% or 5%. They kept the flasks at 35°C for 20 minutes and measured the carbon dioxide collected. Each concentration was tested three times. The team used identical flasks and the same yeast suspension throughout. Their question was: How does glucose concentration affect the rate of carbon dioxide production by yeast?
Glucose concentration
Trial 1
Trial 2
Trial 3
0%
2
1
2
2.5%
18
20
19
5%
34
37
35
Analyse the evidence
Use the results table to answer Questions 1–8.
- Increasing glucose concentration from 0% to 5% was associated with more carbon dioxide being produced.
- Glucose concentration had no effect on carbon dioxide production.
- Yeast produced the most carbon dioxide when no glucose was added.
- The results prove that carbon dioxide production will keep increasing at every glucose concentration.
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