Respiration in Yeast: Balloon Lab- An Experiment
Uploaded by Brainy81 on Dec 16, 2021
Respiration in Yeast: Balloon Lab
Cellular respiration is a series of reactions essential to all living cells. Respiration releases energy from sugars and stores it in the form of adenine triphosphate (ATP). ATP is the basic energy currency for cell processes. Respiration can take place in the presence or absence of oxygen (aerobic vs. anaerobic conditions). For yeast, anaerobic respiration is known as fermentation, and produces carbon dioxide (CO2) along with ethanol, or alcohol, as the primary waste products, while aerobic respiration produces carbon dioxide and water as the primary waste products.
Materials:
Warm water (~110F)
Funnel
Yeast
Sugar packets
Balloons
Stopwatch
String
Ruler
Water bottles (3)
Procedure:
Add 1 packet of yeast to each water bottle
Fill each balloon with 1, 2 or 3 sugar packets
Fill ¼ of the bottle with warm water
Cover with balloon, then tip the sugar into the yeast/water
Measure the circumference of the balloon every 5 minutes for 20 to 25 minutes
Hypothesis:
If more sugar is added to the yeast and water mixture, then
The balloon will inflate and start to grow higher.
Pre-Lab questions (answer these while the experiment is running)
1) What are the products of photosynthesis? Which of those products is used in respiration?
Carbon dioxide, water, and sunlight, glucose, and oxygen. Oxygen and glucose is used in respiration.
2) What is the purpose of cellular respiration?
To pull energy from the bonds of glucose and other food molecules.
3)Why is yeast used in making bread?
Yeast makes bread lighter, softer, and makes it expand.
4) How is the balloon going to help us measure the rate of respiration for the yeast?
Because the balloons will inflate a certain amount based on how much yeast or sugar you add.
5) What is the independent variable in this experiment? (what are we changing for the purpose of this experiment?
We change the amount of sugar
6) What is the dependent variable? (what are we measuring to obtain our results?)
The baloons
7)What are the controlled variables? (what are we keeping the same for each group?)
Yeast