University of Texas, San Antonio BIOLOGY 1404 Lab 4 - Cell Respiration Post-Lab Assignment

Results for Production of Carbon Dioxide in Yeast

Result Table 1. Temperature Effect on Yeast CO 2 Production


Time Room Temp. Experiment Cold Water Experiment Warm Water Experiment
(min) 25 °C 4 °C 37 °C



REx RC CEx CC WEx WC

0mm 0mm 0mm 0mm 0mm 0mm
0
0mm 0mm 0mm 0mm 10 mm 1mm
5
2mm 0mm 0mm 0mm 30mm 2mm
10
15mm 0mm 0mm 0mm 55mm 2mm
15
25mm 0mm 0mm 0mm 55mm 2mm
20
30mm 0mm 0mm 0mm 20mm 2mm
25
35mm 0mm 0mm 0mm 75mm 2mm
30

Question 1 Did your results support your hypothesis?
Yes, our group result supported the hypothesis.




Question 2 Why did the water level in the CO2 collection tube move downward?
The water level in the C02 collection tube move downward because the CO2 pushed
the water downward.




Question 3 Which respirometers in this experiment are the negative controls? Why?
Water is the negative controls in this experiment because there is nothing feeding the
enzymes.

, If ethanol fermentation is used in the process of making bread, how come you don’t
Question 4 get drunk eating bread?
The reason why people do not get drunk eating bread because CO2 produce by yeast
is used to raise bead; therefore, a person is unable to get drunk because the ethanol
fermentation used in bread evaporates.