Which of the Following Statements About the Binding of Oxygen

question 32

Multiple Choice

Which of the following statements about the binding of oxygen to deoxyhemoglobin is correct

• A) The binding of oxygen to Fe²⁺ in the first heme pulls the iron ion into the porphyrin ring, decreasing the affinity for the second oxygen.
• B) The binding of oxygen to Fe²⁺ in the first heme pushes the iron ion out of the porphyrin ring, decreasing the affinity for the second oxygen.
• C) The binding of oxygen to Fe²⁺ in the first heme pulls the iron ion into the porphyrin ring, increasing the affinity for the second oxygen.
• D) The binding of oxygen to Fe²⁺ in the first heme pushes the iron ion out of the porphyrin ring, increasing the affinity for the second oxygen.
• E) Oxygen does not bind to deoxyhemoglobin.

---

Definitions:

Call Option

A financial contract giving the buyer the right, but not the obligation, to purchase an asset at a specified price within a certain time period.

Spot Exchange Rates

The current exchange rate at which a currency can be bought or sold for immediate delivery.

Speculative Derivatives

Financial instruments used to speculate on the future movements of asset prices, without intention of holding the underlying assets.