5c. If not, what additional information would we need to collect to tell whether the yeast used aerobic respiration or anaerobic (ethanol) fermentation?

Human Anatomy & Physiology (11th Edition)
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Chapter1: The Human Body: An Orientation
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Question 5c

### Lab 10: Cell Respiration Replacement Questions 5 & 6

#### Page 112 of Lab Answer Sheet

**5a. What gas did the yeast produce?**
   - **Answer:** CO₂

   Yeast produces this gas (from 5a) during both aerobic respiration and anaerobic (ethanol) fermentation.

---

**5b. Therefore, based only on this information, can you tell whether the yeast used aerobic respiration or anaerobic (ethanol) fermentation?**
   - **Answer:** No

---

**5c. If not, what additional information would we need to collect to tell whether the yeast used aerobic respiration or anaerobic (ethanol) fermentation?**

---

**Explanation:**

1. **Question 5a** investigates the gas produced by yeast, which in this case is identified as carbon dioxide (CO₂).

2. **Question 5b** addresses the fact that CO₂ is produced during both aerobic respiration and anaerobic fermentation. Therefore, simply knowing that CO₂ is produced does not provide enough information to differentiate between the two pathways of respiration.

3. **Question 5c** implies the need for additional data. To distinguish between aerobic respiration and anaerobic fermentation, one could measure other byproducts of the processes. For example, measuring ethanol production would suggest anaerobic fermentation, while measuring oxygen consumption or water production could indicate aerobic respiration.

This material is foundational for understanding cellular respiration and fermentation, important biological processes used by cells to generate energy. The key takeaway is recognizing the different conditions and outputs of aerobic versus anaerobic respiration.
Transcribed Image Text:### Lab 10: Cell Respiration Replacement Questions 5 & 6 #### Page 112 of Lab Answer Sheet **5a. What gas did the yeast produce?** - **Answer:** CO₂ Yeast produces this gas (from 5a) during both aerobic respiration and anaerobic (ethanol) fermentation. --- **5b. Therefore, based only on this information, can you tell whether the yeast used aerobic respiration or anaerobic (ethanol) fermentation?** - **Answer:** No --- **5c. If not, what additional information would we need to collect to tell whether the yeast used aerobic respiration or anaerobic (ethanol) fermentation?** --- **Explanation:** 1. **Question 5a** investigates the gas produced by yeast, which in this case is identified as carbon dioxide (CO₂). 2. **Question 5b** addresses the fact that CO₂ is produced during both aerobic respiration and anaerobic fermentation. Therefore, simply knowing that CO₂ is produced does not provide enough information to differentiate between the two pathways of respiration. 3. **Question 5c** implies the need for additional data. To distinguish between aerobic respiration and anaerobic fermentation, one could measure other byproducts of the processes. For example, measuring ethanol production would suggest anaerobic fermentation, while measuring oxygen consumption or water production could indicate aerobic respiration. This material is foundational for understanding cellular respiration and fermentation, important biological processes used by cells to generate energy. The key takeaway is recognizing the different conditions and outputs of aerobic versus anaerobic respiration.
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