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d Proline... GlyProPro repeatedly wrapped into a rope, the whole forming an Helix. Natural Collagen may also have some other Amino Acids inserted along parts of the chain. COLLAGEN an important animal connective tissue Left Collagen Fibres from the tendon of a bird’s neck. Right Collagen Fibres from a rats tail TERTIARY STRUCTURE Tertiary Structure describes the shapes which form when the secondary spirals of the protein chain further fold up on themselves. QUATERNARY STRUCTURE Quaternary structure describes any final adjustments to the molecule before it can bee active. For example, pairs of chains may bind together or other inanic substances may be incorporated into the molecule. (Prosthetic Groups) MYOGLOBIN An oxygen carrier in muscle similar to Haemoglobin Tertiary Stucture Spot the Tertiary folding. Quaternary Structure Spot the Haem group (Side chains have been omitted for clarity.) The Haem group looks like this... Haem is an inanic molecule called a Porphryn Ring. In Haemoglobin and Myoglobin it has an Iron ion at its centre and is a vital for the carriage of Oxygen. Such