Proteins

• What is the primary structure?

  order of amino acids in polypeptide chain - this is a polymer
• What is a secondary structure?

  • sequence of amino acids that cause protein to bend into alpha helix shape or fold into beta pleated sheets
  • hydrogen bonds hold it together
• What is a tertiary structure?

  • further folding of the secondary structure
  • forms 3D shape
  • held together by ionic, hydrogen and disulphide bonds
• What is a quaternary structure?

  protein made of more than one polypeptide chain
• What are proteins?

  large and complex polymer molecule made up of long chains of amino acids
• What are polypeptides?

  chains of amino acids added to a dipeptide
• Describe the primary structure of proteins?

  a sequence of amino acids linked together to form a polypeptide chain
• Describe the secondary structure

  forms as alpha helix molecules due to the shape of the polypeptide chain as a result of hydrogen bonding
• What is the test and results for proteins?

  • biuret test
  • purple = positive result
  • blue = negative result