3.1.1 Frequently elements in living things 1.Sulphur (amino acids) 2.Calcium Bones / Teeth 3.Iron haemoglobin (animal) and in the cytochrome proteins.

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3.1.1 Frequently elements in living things

1.Sulphur (amino acids) 2.Calcium Bones / Teeth 3.Iron haemoglobin (animal) and in the cytochrome proteins involved in eˉ transport in animals & plants. 4.Sodium nerve impulse 5.Phosphorus cell membrane structures & nucleotides Other elements in living things

Water is a Polar Molecule has oppositely charged ends A hydrogen bond is a type of intermolecular force that forms when a hydrogen in one polar molecule is attracted to the slightly negative atom of another polar molecule Water Structure: H 2 O

3.1.5 Properties of water The hydrogen bonding between molecules leads to additional properties in water. The three of the more important properties for biological systems include: SOLVENT PROPERTIES COHESIVE PROPERTIES THERMAL PROPERTIES

3.1.5 Properties of water and its uses in living organisms…