The graph shows the oxygen-binding curves for myoglobin and hemoglobin. Label the graph and answer the questions. 1.0 0.5 0 myoglobin P50 = 10 hemoglobin P50 = 20 30 40 Which protein has a higher affinity for oxygen? 50 Answer Bank Hemoglobin curve Saturation Use the curves to determine the partial pressure of oxygen at 50% saturation for hemoglobin and myoglobin. Myoglobin curve O₂ pressure (torr) tor tor

Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
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Q3:

**Hemoglobin P50 Calculation**

Enter the value of hemoglobin \( P_{50} \) in torr:

---

**Question:**

Which protein has a higher affinity for oxygen?

- Myoglobin
- Hemoglobin
- They are equal

(Choose the correct answer from the dropdown menu provided.)
Transcribed Image Text:**Hemoglobin P50 Calculation** Enter the value of hemoglobin \( P_{50} \) in torr: --- **Question:** Which protein has a higher affinity for oxygen? - Myoglobin - Hemoglobin - They are equal (Choose the correct answer from the dropdown menu provided.)
The graph illustrates the oxygen-binding curves for myoglobin and hemoglobin. It is accompanied by an "Answer Bank" containing terms that need to be labeled on the graph: Hemoglobin curve, Myoglobin curve, Saturation, and O₂ pressure (torr).

### Graph Description:

- **Axes:**
  - The x-axis is labeled as "O₂ pressure (torr)" and ranges from 0 to 50.
  - The y-axis represents "Saturation" and ranges from 0 to 1.0.

- **Curves:**
  - The graph has two curves: one orange and one green.
  - The orange curve reaches saturation rapidly and plateaus near saturation of 1.0, indicating high affinity. This should be labeled as the "Myoglobin curve."
  - The green curve rises more gradually and reaches saturation at higher partial pressures, labeled as the "Hemoglobin curve."

### Questions for Analysis:

1. **Determine P₅₀ Values:**
   - Use the graph to determine the partial pressure of oxygen (P₅₀) at which myoglobin and hemoglobin are 50% saturated.
   - For myoglobin and hemoglobin, note the oxygen pressure corresponding to 0.5 saturation on their respective curves.

2. **Which Protein has a Higher Affinity for Oxygen?**
   - Compare the P₅₀ values: the protein with the lower P₅₀ value has a higher oxygen affinity.

### Answer Fields:

- **Myoglobin P₅₀ =** [Enter value] torr
- **Hemoglobin P₅₀ =** [Enter value] torr

### Conclusion:

Evaluate which protein, myoglobin or hemoglobin, has a higher affinity for oxygen based on their respective P₅₀ values.
Transcribed Image Text:The graph illustrates the oxygen-binding curves for myoglobin and hemoglobin. It is accompanied by an "Answer Bank" containing terms that need to be labeled on the graph: Hemoglobin curve, Myoglobin curve, Saturation, and O₂ pressure (torr). ### Graph Description: - **Axes:** - The x-axis is labeled as "O₂ pressure (torr)" and ranges from 0 to 50. - The y-axis represents "Saturation" and ranges from 0 to 1.0. - **Curves:** - The graph has two curves: one orange and one green. - The orange curve reaches saturation rapidly and plateaus near saturation of 1.0, indicating high affinity. This should be labeled as the "Myoglobin curve." - The green curve rises more gradually and reaches saturation at higher partial pressures, labeled as the "Hemoglobin curve." ### Questions for Analysis: 1. **Determine P₅₀ Values:** - Use the graph to determine the partial pressure of oxygen (P₅₀) at which myoglobin and hemoglobin are 50% saturated. - For myoglobin and hemoglobin, note the oxygen pressure corresponding to 0.5 saturation on their respective curves. 2. **Which Protein has a Higher Affinity for Oxygen?** - Compare the P₅₀ values: the protein with the lower P₅₀ value has a higher oxygen affinity. ### Answer Fields: - **Myoglobin P₅₀ =** [Enter value] torr - **Hemoglobin P₅₀ =** [Enter value] torr ### Conclusion: Evaluate which protein, myoglobin or hemoglobin, has a higher affinity for oxygen based on their respective P₅₀ values.
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