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Yeast Experiment: Growth #2 – Is Yeast Alive?

QUESTION

IS YEAST ALIVE?

MATERIALS

  • Two glass measuring cups, 1-cup capacity each
  • Measuring spoon: teaspoon
  • Granulated sugar
  • Thermometer (to measure water temperature)
  • Warm water (110-115°F)
  • One packet of Red Star Active Dry Yeast (packet is ¼-ounce or 2 ¼ teaspoons)

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?

Review & Comments

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