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CAIE A-Level Biology Notes — Topic 2: Biological Molecules (9700) | Carbs, Lipids, Proteins, Water

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Explains monomers, polymers, bonding, enzyme reactions, protein structure levels, and tests for biomolecules. Ideal for Paper 1 & 2 revision.

Institution
CIE
Course
Unit 2 - B Biological Molecules (9700)

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Cambridge (CIE) AS Your notes
Biology
Water
Contents
The Role of Water in Living Organisms
Water & the Hydrogen Bond




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, The Role of Water in Living Organisms
Your notes

Water Molecules: In Living Organisms
Water has many essential roles in living organisms due to its properties:
The polarity of water molecules
The presence and number of hydrogen bonds between water molecules

Solvent
As water is a polar molecule many ionic compounds (e.g. sodium chloride) and
covalently bonded polar substances (e.g. glucose) will dissolve in it
This allows chemical reactions to occur within cells (as the dissolved solutes are
more chemically reactive when they are free to move about)
Metabolites can be transported efficiently (except non-polar molecules which are
hydrophobic)

Polarity of Water Diagram




Due to its polarity water is considered a universal solvent




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Connected book

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Mary Jones, Richard Fosbery Cambridge International AS and A Level Biology Coursebook with CD-ROM
  • augustus 2014
  • 9781107636828
  • 4

Written for

Study Level
A/AS Level
Examinator
CIE
Subject
Biology
Unit
Unit 2 - B Biological Molecules (9700)

Document information

Uploaded on
November 22, 2025
Number of pages
7
Written in
2025/2026
Type
Class notes
Professor(s)
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Subjects

  • biology
  • 9700
  • chapter 2
  • biological molecules
  • monomers
  • polymers
  • bonding
  • enzyme reactions
  • protein structure levels
  • tests for biomolecules
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