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CIE AS Biology (9700) 2019-2021 Revision Notes

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2. Biological Molecules

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Page 54

2.3.3 PROTEIN SHAPE

Proteins: Interactions & Shape

A polypeptide chain will fold differently due to the interactions (and hence the bonds that

form) between R groups. The three-dimensional configuration that forms is called the

tertiary structure of a protein

Each of the twenty amino acids that make up proteins has a unique R group and therefore

many different interactions can occur creating a vast range of protein configurations and

therefore functions

Within tertiary structured proteins are the following bonds:

Strong covalent disulphide

Weak hydrophobic interactions

Weak hydrogen

Ionic

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