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Oxygen dissociation curve of haemoglobin is

1. (a) Sigmoid
2. (b) Hyperbolic
3. (c) Linear
4. (d) Hypobolic

Correct answer: (a) Sigmoid

Solution

Hemoglobin shows positive cooperativity, so its oxygen saturation rises slowly at first, then steeply, then levels off. That produces a sigmoid (S-shaped) dissociation curve rather than a simple hyperbola or straight line.

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