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Which of these type of curve shows the oxygen binding capacity of hemoglobin?

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Which of these type of curve shows the oxygen binding capacity of hemoglobin?

(a) Hyperbolic curve

(b) Sigmoidal curve

(c) Exponential curve

(d) Linear curve

I had been asked this question in an online quiz.

I'd like to ask this question from Fibrous and Globular Proteins topic in division Biomolecules and Catalysis of Life Sciences

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Correct answer is (b) Sigmoidal curve

Easy explanation: A single molecule of hemoglobin binds up to four molecules of oxygen (Hb+4O2 = Hb(O2)4). The sigmoidal curve shows the cooperativity in binding of oxygen and hemoglobin. This curve is a plot between the fractional saturation of hemoglobin versus the partial pressure of oxygen.

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