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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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Collagen is a fibrous structural protein that is formed by triple helices collagen molecules

arranging into collagen fibrils and finally into collagen fibres which have high tensile

strength

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CIE AS Biology (9700) 2019-2021 Revision Notes

savemyexams.co.uk

2. Biological Molecules

YOUR NOTES

⬇

© 2015-2021 Save My Exams Ltd

CIE AS Biology (9700) 2019-2021 Resources

REVISION NOTES 

 

  TOPIC QUESTIONS 

 

  PAST PAPERS

Page 62

Function

Flexible structural protein forming connective tissues

The presence of the many hydrogen bonds within the triple helix structure of collagen

results in great tensile strength. This enables collagen to be able to withstand large

pulling forces without stretching or breaking

The staggered ends of the collagen molecules within the fibrils provide strength

Collagen is a stable protein due to the high proportion of proline and hydroxyproline amino

acids result in more stability as their R groups repel each other

Length of collagen molecules means they take too long to dissolve in water (collagen is

therefore insoluble in water)