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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
suggestion for middle school students
We have used Cellular Respiration in Yeast with high school students, typically ninth graders. For seventh and eighth graders we recommend Is Yeast Alive? (/sci_edu/waldron/#yeast). This activity provides a simpler approach to yeast metabolism which is more appropriate for most middle school students. You could use pages 1-3 of the student handout for Is Yeast Alive? and omit the part on growth of yeast if you want to focus just on metabolism.
Ingrid Waldron