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Haemoglobin and Collagen


Haemoglobin is an example on a globular protein, a protein that appears to curl up into a ball. It is a
pigment which is found in red blood cells and carries oxygen. Haemoglobin has four polypeptide
chains, two and two . Each of these chains winds…

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when oxygen levels are low, the valine molecules stick together and this causes the haemoglobin
molecules stick together and this pulls the red blood cell out of shape.


Collagen is a fibrous protein, meaning that it is structured as long strands. It is found in skin, tendons,
bones, teeth,…


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