| Front | Haemoglobin contains a prosthetic group known as haem. Collagen does not contain a prosthetic group. Describe three other ways in which the structure of haemoglobin differs from that of collagen |
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| Back | - haemoglobin has 4 subunits wheras collagen repeating units - haemoglobin globular - haemoglobin has hydrophobic R-groups inside and hydrophillic outside |
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