A Solution of Equal Amounts of Hemoglobin and Myoglobin Is

question 2

Multiple Choice

A solution of equal amounts of hemoglobin and myoglobin is maintained at a very low partial pressure of oxygen, so that both proteins exist predominantly in the deoxygenated form.What happens when the solution is then bubbled with a small amount of oxygen?

• A)Myoglobin undergoes a conformational change that raises its oxygen affinity above that of hemoglobin.
• B)2,3-BPG dissociates from hemoglobin and binds to myoglobin.
• C)Much more of the dissolved oxygen binds to myoglobin than to hemoglobin.
• D)Hemoglobin dissociates into its subunits.
• E)Most hemoglobin becomes oxygenated, whereas most myoglobin remains deoxygenated.

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