proteins

• What are proteins?

  Molecules composed of carbon, hydrogen, oxygen, nitrogen and sometimes sulfur and phosphorus
• Proteins form small molecules called amino acids.
• They are 20 different amino acids
• How are proteins formed?

  Formed by the condensation of hundreds or thousands of amino acids molecules in long chains
• Peptide links are links between adjacent amino acid molecules
• Some are soluble in water- haemoglobin

  Others are insoluble- collagen
• Why do we need proteins?


  used to build muscle

  to make cells and enzymes

  to make antibodies
• Foods that contain proteins:

  • beans
  • tofu
  • egg
  • meats