Download YEAST RESPIRATION LAB Name 1. Write the chemical equation for

YEAST RESPIRATION LAB
PRE-LAB QUESTIONS
1. Write the chemical equation for respiration.
Name
2. Yeast can metabolize sugar aerobically or anaerobically. What does each of these terms mean?
3. Why are we using a carbon dioxide probe to measure cellular respiration?
DATA
Time (min)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Table 1
Carbon Dioxide Concentration
(ppm = parts per million)
Glucose
Sucrose
Lactose
Sugar Tested
Respiration Rate (m)
(ppm/s)
Table 2
Glucose
Sucrose
Lactose
Table 3
Class Averages
Sugar
Respiration
Tested
Rate
Glucose
Sucrose
Lactose
YEAST RESPIRATION ANALYSIS QUESTIONS
1. Considering the results of this experiment, does yeast equally utilize all sugars?
2. Which sugar is most effective for cellular respiration of yeast? Explain how you know this.
3. Which sugar is least effective for cellular respiration of yeast? Explain how you know this.
4. Organisms use proteins called ENZYMES to help in the breakdown of food molecules. Every enzyme is specific for a
certain type of reaction. What do your results suggest about the enzymes present or absent in yeasts?