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CIE AS Biology (9700) 2019-2021 Resources

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The quaternary structure of a protein. This is an example of haemoglobin which contains

four subunits (polypeptide chains) working together to carry oxygen

Summary of bonds in proteins table

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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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CIE AS Biology (9700) 2019-2021 Resources

REVISION NOTES 

 

  TOPIC QUESTIONS 

 

  PAST PAPERS

Page 53

Exam Tip

Familiarise yourself with the difference between the four structural levels found in proteins,

noting which bonds are found at which level. Remember that the hydrogen bonds in tertiary

structures are between the R groups whereas in secondary structures the hydrogen bonds

form between the amino and carboxyl groups.

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