- In the first set of experiments, you dissolve 1g yeast ineither water, or 10% solutions of different sugars. At roomtemperature, you set up the eudiometers in parallel, with lots ofair in each flask before you begin. These are the results. Plotthem using the scatter plot function, set the Y intercept=0, anddisplay the equations of the trendlines on the chart, with thetitle and axes carefully labeled. You can select/copy/paste thedata shown in each table by clicking the little icon in the upperleft hand corner or you may use the Excel spreadsheet provided onCanvas. Insert your graph below the data table and answer thefollowing questions. For all of the eudiometer experiments theCO2 is measured in cubic centimeters or milliliters ofdisplacement (of the colored water).
Time (minutes) | no sugar | glucose | sucrose | maltose | lactose | galactose |
0 | 0 | 0 | 0 | 0 | 0 | 0 |
5 | 0 | 3 | 2.8 | 3.1 | 0.1 | 0.1 |
10 | 0 | 6 | 5.6 | 6.2 | 0.2 | 0.15 |
15 | 0 | 9 | 8.8 | 9.3 | 0.3 | 0.2 |
20 | 0 | 12 | 11.5 | 12.5 | 0.3 | 0.3 |
25 | 0 | 15 | 13.9 | 15.7 | 0.3 | 0.3 |
30 | 0 | 18 | 17.2 | 18.9 | 0.3 | 0.3 |
35 | 0 | 21 | 20 | 22 | 0.3 | 0.3 |
40 | 0 | 24 | 23.5 | 25 | 0.3 | 0.3 |
45 | 0 | 27 | 26.5 | 28.5 | 0.3 | 0.3 |
50 | 0 | 30 | 29.5 | 31.6 | 0.3 | 0.3 |
55 | 0 | 33 | 32.3 | 34.8 | 0.3 | 0.3 |
60 | 0 | 36 | 35.2 | 37.8 | 0.3 | 0.3 |
a) Which of thesugars are being used for cellular respiration by yeast at roomtemperature?
b) What is the rateof CO2 production for glucose in this experiment?
c) Explain whyyeast might not be able to use the other sugars for cellularrespiration.
d) Consider themolecular structures of glucose and maltose. How might theseresults differ if you used 1M solutions instead of 10%solutions?
