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Polarity creates hydrogen bonding

Polarity creates hydrogen bonding

Labelled water molecules showing partial charges and hydrogen bonds

Water is a major component of cytoplasm, blood plasma, tissue fluid, and plant sap, so many biological reactions happen in an aqueous environment. Its biological importance starts with structure: in each H2OH_2OH2​O molecule, oxygen attracts the shared electrons more strongly than hydrogen does.

Water Lesson

  1. A Level
  2. /Biology
  3. /Water

Step-by-step lessons covering AQA A Level Biology Water for A Level Biology. Each lesson breaks down Water, then works through exam-style questions in Paper 1, Paper 2 and Paper 3 format. Build a strong foundation in cell biology and biochemistry early on, since later topics on genetics, ecology and physiology all draw on these core concepts.