What change in haemoglobin did Stokes show?
Temperature sensitivity
Colour changes by aeration
pH sensitivity
Viscosity changes
Answer
Colour changes by aeration refers to the observation made by Stokes that haemoglobin undergoes colour changes when exposed to different levels of oxygen. In the presence of oxygen, haemoglobin turns bright red, while in the absence of oxygen, it becomes dark red or purple. This colour change is due to the binding of oxygen to the haem group in haemoglobin, which alters its electronic structure and hence its colour.
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