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This lesson covers the structure and function of haemoglobin, the oxygen dissociation curve, and factors that affect oxygen transport, as required by the Edexcel A-Level Biology specification (9BI0). You need to understand cooperative binding, the sigmoid shape of the dissociation curve, the Bohr effect, and how different haemoglobins are adapted to different environments.
Haemoglobin (Hb) is a globular protein found in red blood cells (erythrocytes). Each molecule consists of:
Haemoglobin is an example of a protein with quaternary structure — it is composed of multiple polypeptide subunits held together by hydrophobic interactions, hydrogen bonds, and ionic bonds.
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