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C4.2.8—Heterotrophs as organisms that use carbon compounds obtained from other organisms to synthesize the carbon compounds that they require


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

Aerobic Respiration

Experiment #17 from Biology with Vernier

In this experiment, you will

  • Measure changes in dissolved oxygen concentration.
  • Study the effect of temperature on cellular respiration.
  • Make a plot of the rate of cellular respiration as a function of temperature.

Educational Standard
International Baccalaureate (IB) 2025
C Interactions and interdependence
Level of organization
4 Ecosystems
C4.2 Transfers of energy and matter
Standard level and 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.