A Tradition in Family Baking

Growth #2 – Is Yeast Alive?

The Science of Yeast

 

Growth #2 – Is Yeast Alive?

QUESTION
IS YEAST ALIVE?

MATERIALS

  • 2 glass measuring cups, 1-cup capacity each
  • teaspoon
  • granulated sugar
  • thermometer (to measure water temperature)
  • warm water (110° to 115°F)
  • 1 packet of Active Dry Yeast (a packet is 1/4 ounce, or 2-1/4 tsp)

PROCEDURE
1. Make a yeast solution using 1/2 cup warm water (110° to 115°F), 1 teaspoon sugar and 1/4 ounce package of Active Dry Yeast.
2. Each day, transfer 1 teaspoon of original yeast solution to a NEW solution of 1/2 cup warm water (110° to 115°F) and 1 teaspoon sugar.
3. Make another sugar solution and add 1 teaspoon water daily.
4. Keep a record of your progress for five (5) days.

OBSERVATIONS & CONCLUSION
1. What do you observe happening to each of your containers?
2. Does the yeast culture continue to multiply even though it becomes diluted by the daily transfer?