Name_______________________________________________________Date__________________________________Period__________
The Importance of Yeast in Industry
Introduction:
Living organisms get their energy from simple sugar by one of two methods:
1. Respiration which produces carbon dioxide and water.
2. Fermentation which produces carbon dioxide and ethyl alcohol.
Yeast is commonly used in industry to make many products. In this lab, you will observe the effect of yeast (a form of
fungus) on grapes.
Data: Use the data table to record observations during the lab.
Day 1 (10/7)
Day 2 (10/8)
Day 3 (10/9)
Mushed grapes, air removed
from bag.
Name_______________________________________________________Date__________________________________Period__________
The Importance of Yeast in Industry
Introduction:
Living organisms get their energy from simple sugar by one of two methods:
1. Respiration which produces carbon dioxide and water.
2. Fermentation which produces carbon dioxide and ethyl alcohol.
Yeast is commonly used in industry to make many products. In this lab, you will observe the effect of yeast (a form of
fungus) on grapes.
Data: Use the data table to record observations during the lab.
Day 1 (10/7)
Day 2 (10/8)
Mushed grapes, air removed
from bag.
Day 3 (10/9)
Analysis: ANSWER QUESTIONS IN COMPLETE SENTENCES .
1. What type of respiration occurred?
2. What type of fermentation occurred?
3. What type of gas should be within the baggie?
4. What was the liquid collected in the baggie?
5. What is the chemical equation for fermentation?
6. What was the purpose of having the grapes in the baggie?
7. What is yeast?
8. Do your muscle cells go through the same process when they run out of oxygen? Explain.
9. Based on what you have learned in this lab, why does bread dough rise?
Analysis: ANSWER QUESTIONS IN COMPLETE SENTENCES .
1. What type of respiration occurred?
2. What type of fermentation occurred?
3. What type of gas should be within the baggie?
4. What was the liquid collected in the baggie?
5. What is the chemical equation for fermentation?
6. What was the purpose of having the grapes in the baggie?
7. What is yeast?
8. Do your muscle cells go through the same process when they run out of oxygen? Explain.
9. Based on what you have learned in this lab, why does bread dough rise?