What is positive cooperativity in the context of hemoglobin?

• A. The binding of one oxygen molecule increases the affinity for subsequent oxygen molecules.
• B. The binding of one oxygen molecule causes hemoglobin to release all bound oxygen molecules.
• C. The binding of one oxygen molecule has no effect on the affinity for subsequent oxygen molecules.
• D. The binding of one oxygen molecule decreases the affinity for subsequent oxygen molecules.

Answer: (A)