Proteins contain:

• Carbon

• Hydrogen

• Oxygen

• Nitrogen

Some may also contain:

• Sulphur

• Phosphorus

• Iron

Found in:

• Lean meat

• Fish

• Soya

• Pulses

• Eggs

Structure of protein

• Made up of long chain of amino acids

• There are 20 common amino acids in protein

Amino Acids

• Joined together by peptide bonds → formation of polypeptide chains

Structural role

• Keratin → hair

• Myosin→ muscle

Metabolic role

• Enzymes → biological catalyst

• Hormones → normal functioning heart rate, sleep and reproduction