Madison is conducting a biotechnology experiment in her kitchen. Her goal is to make yogurt with a pH of 4.5 in the optimal time of 4 hours. Normally, she uses a mixed culture of L. bulgaricus and S. thermophiles to ferment yogurt. She designs her experiment to include the mixed
cultures but also with the L. bulgaricus culture alone to see which would ferment faster. She graphs her results to display her data.
Mixed vs. Single Culture
Yogurt Results
7
Milk Alone
6
L. bulgaricus
6
PH
5
4
S. thermophilis +
L. bulgaricus
3
0 2 4
Time (Hours)
6
What conclusion can Madison draw from her results?