CIE AS Biology (9700) 2019-2021 Revision Notes
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2. Biological Molecules
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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.