In order for scientists to decide which conditions produce the most efficient growth of yeast, which of the following experiments would most likely need to be completed next?
F. Varying the amount of yeast added to the test tubes and repeating the steps of Experiment 3
G. Repeating Experiments 1 through 3, measuring for alcohol content rather than carbon dioxide
H. Measuring yeast growth in a solution of pure water
J. Testing varying sucrose concentrations with added nutrients of ammonium sulfate, potassium dihydrogen phosphate, minerals, and vitamins in a fourth experiment.

Experiment 1

Since yeast needs sucrose to ferment and molasses is 60% sucrose, scientists first study yeast grown in molasses. Five test tubes are filled with .4 grams of yeast and various molasses concentrations. Carbon dioxide levels are measured as an indication of fermentation for each test tube after one day and again after two days. These levels are shown in Table 1.

Experiment 2
Five different test tubes are filled with .4 grams of yeast and various pure sucrose dilutions. Carbon dioxide levels are then measured as an indication of fermentation after one and two days. These levels are shown in Table 2.

Experiment 3
Eight more test tubes were filled with .4 grams of yeast and a 15% sucrose solution. Various combinations of ammonium sulfate, potassium dihydrogen phosphate, minerals, and vitamins were added to the test tubes. Carbon dioxide levels were measured after one and two days. These levels are shown in Table 3.

Transcribed Image Text:

1 2 3 4 5 Molasses (%) 6.2 12.5 25 50 100 Table 1 CO₂ (mm) Day 1 2 6 24 69 86 CO₂ (mm) Day 2 9 32 78 94 100