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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 56

Ionic

Ionic bonds form between positively charged (amine group -NH

3

+

) and negatively

charged (carboxylic acid -COO

–

) R groups

Ionic bonds are stronger than hydrogen bonds but they are not common

These bonds are broken by pH changes

Hydrogen

Hydrogen bonds form between strongly polar R groups. These are the weakest bonds that

form but the most common as they form between a wide variety of R groups

Hydrophobic interactions

Hydrophobic interactions form between the non-polar (hydrophobic) R groups within

the interior of proteins

Exam Tip

You need to be able to determine which bonds are found in tertiary structures and recognise

them in diagrams.

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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