Name:
Period:
Date:
Lab: Cellular Respiration
P 337: During cellular respiration, yeast produces a gas. You are to collect the gas in a balloon to
see the amount of gas produced by the yeast. Yeast needs only sugar, oxygen, and water to survive
and reproduce. Yeast placed in a plastic bottle (or test tube) with sugar and water carries out basic
processes such as cellular respiration.
Bottle
Water
Sugar
Yeast
#1
mL
g
g
#2
mL
g
g
#3
mL
g
g
#4
mL
g
g
#5
#6
mL
g
g
mL
g
g
#7
mL
g
g
Circumference
Experiment:
What is the manipulated variable?
What is the responding variable?
What are the controlled variables?
Write a hypothesis for this experiment: (If… Then … Because …)
Graph:
Data Analysis:
What do I see?
What does it mean?
Caption:
#8
mL
g
g
Conclusion:
Questions:
1. How might the amount of yeast affect the amount of gas that you gather in the
balloon?
2. How might the amount of sugar affect the amount of gas that you gather in the
balloon?
3. Which variable had a greater impact on gas production?
4. What variable or variables affected the volume of the balloon? Provide
evidence.
5. Yeast needs a source of food in the form of chemical energy for cellular
respiration. What do you think was the source of chemical energy in this
investigation?