GCE CIE BIOL - Haemoglobin (Globular Proteins)
Chapter 2 Biological Molecules
2.3.c Describe the molecular structure of haemoglobin as an example of a globular protein, and of collagen as an example of a fibrous protein and relate these structures to their functions (The importance of iron in the haemoglobin molecule should be emphasised. A haemoglobin molecule is composed of two alpha (α) chains and two beta (β) chains, although when describing the chains the terms α-globin and β-globin maybe used. There should be a distinction between collagen molecules and collagen fibres).
The above image shows the structure of a globular protein.
The above image shows haemoglobin structure when loaded with oxygen (oxyhaemoglobin), and when not loaded with oxygen.
The above image shows a comparison between normal blood cells, and sickle cell anaemia cells.
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Written by Aayushi | GCE CIE Biology Specialist @ TUTTEE
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