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Topic 01Biology

A1.1 Water

Water's polarity and hydrogen bonding explain cohesion, adhesion, solvent properties and the physical conditions of aquatic habitats; AHL extends to its possible extraterrestrial origin.

Practice questions
1

Why water is a polar molecule

Polarity and dipoles · Hydrogen bonding between water molecules

30 min
2

Cohesion, adhesion and the properties of water

Cohesion & surface tension · Solvent & heat buffer · Water vs air habitat · Origin of water (HL)

30 min

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A1.2 Nucleic acids