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D2.2.8—Examples of environmental effects on gene expression in cells and organisms


Here are experiments our science specialists have selected to support this IB* topic.

Sugar Metabolism with Yeast (Carbon Dioxide Gas)

Experiment #10A from Investigating Biology through Inquiry

In the Preliminary Activity, you will use a CO2 Gas Sensor to determine the rate of respiration of glucose by yeast.

After completing the Preliminary Activity, you will first use reference sources to find out more about sugars, respiration, and yeast before you choose and investigate a researchable question dealing with the respiration of sugars by yeast. Some topics to consider in your reference search are:

  • sugars
  • carbohydrates
  • monosaccharides
  • disaccharides
  • polysaccharides
  • yeast
  • glycolysis
  • metabolism
  • aerobic respiration
  • anaerobic respiration

Sugar Metabolism with Yeast (Ethanol)

Experiment #10B from Investigating Biology through Inquiry

  • Identify variables, design and perform the experiment, collect data, analyze data, draw a conclusion, and formulate a knowledge claim based on evidence from the experiment.
  • Obtain graphic representations of fermentation rate.
  • Determine fermentation rate by yeast while using different sugars.
  • Determine which sugars can be used as a food source by yeast.

Educational Standard
International Baccalaureate (IB) 2025
D Continuity and change
Level of organization
2 Cells
D2.2 Gene expression
Additional higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.