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27th September 2001 AT1 practical assessment - yeast respiration AIM => investigate one thing that will change the rate of yeast respiration. When yeast respires, it is anaerobic, so the equation for yeast respiration is: Glucose => ethanol + carbon dioxide + energy There are two things that could change the rate of this respiration. These are; * A change in concentration * A change in temperature Increasing the concentration of glucose increases the rate of respiration because, based on the collision theory, there will be more glucose particles to collide with the active site of the yeast enzymes. Increasing the temperature will increse the rate of respiration because the molecules will have more energy. This means they will be moving faster, and will collide with the active site of the enzymes more often and with more force. PRELIMINARY WORK => To help me decide which variable to investigate, and what measurements I would use, I did some preliminary...

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