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Yeast Respiration Lab

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Yeast Respiration Lab

Yeast cells undergoing cellular respiration

🧪 Part 1: Pre-Lab Understanding

I can statement: I can explain how yeast cells use glucose to produce ATP through cellular respiration.

1. What is the main product of cellular respiration that provides energy for cells?

Glucose

ATP

Carbon dioxide

Water

2. Complete the cellular respiration equation:

Glucose + __________ → ATP + __________ + __________

3. When oxygen is NOT available, yeast can still produce ATP through:

Aerobic respiration

Anaerobic respiration (fermentation)

Photosynthesis

Digestion

4. What gas is produced during yeast fermentation that we can observe?

📊 Part 2: Lab Observations & Data

I can statement: I can collect and analyze evidence of energy transfer in living systems.

5. Record your observations of foam height (evidence of CO₂ production):
Time (minutes) Foam Height (cm) Observations
0 _______ _________________
5 _______ _________________
10 _______ _________________
15 _______ _________________
6. What evidence shows that yeast cells are using glucose for energy?

Foam production

Gas bubbles

Temperature change

Sweet smell

🧠 Part 3: Analysis & Real-World Connections

I can statement: I can connect cellular respiration to energy needs in living organisms, including humans.

7. During intense exercise, your muscles may not get enough oxygen. What type of respiration occurs?

Aerobic respiration

Anaerobic respiration

Photosynthesis

No respiration occurs

8. What substance builds up in your muscles during anaerobic respiration and causes fatigue?

_________________ acid

9. Explain how the yeast lab demonstrates the conservation of matter and energy. Use the terms: glucose, ATP, carbon dioxide.
10. Why do athletes need to consume glucose (carbohydrates) before and during long competitions?
11. Extension: How might this lab help explain why bread dough rises?

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