Which Statement About the Binding of Oxygen by Hemoglobin Is

question 93

Multiple Choice

Which statement about the binding of oxygen by hemoglobin is true?

• A) The percentage of completely O₂-saturated hemoglobin decreases as PO₂ increases.
• B) The O₂-binding/dissociation curve is U-shaped.
• C) Over the full length of the O₂-binding/dissociation curve, O₂ dissociation-association is rapid.
• D) A very low PO₂ is required for all four hemoglobin subunits to bind to O₂.
• E) Once one subunit of hemoglobin binds to O₂, the affinity of the remaining subunits for their O₂ increases until three O₂ are bound.

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Definitions:

Equity

The value of an asset after deducting the value of liabilities, representing ownership interest in a company or property.

Cost of Capital

The rate of return that a company must earn on its project investments to maintain its market value and attract funds.

Debt/Equity Ratio

A fiscal ratio that reflects the comparative amount of equity from shareholders and borrowed funds utilized to support a company's resources.

DFL

Degree of Financial Leverage, a ratio that measures the sensitivity of a company’s earnings per share to fluctuations in its operating income, based on its capital structure.