Secondary structure

• what is the secondary structure

  • when the primary structure of the polypeptide folds
• what are the 2 types of secondary structures that can be formed

  • alpha - helix
  • beta - pleated sheer
• what is the most common type of secondary structure

  • the alpha helix
• what holds the spiral shape of the alpha helix in place

  hydrogen bonds
• give examples of the secondary structure

  • keratin (in hair + nails)
  • collagen (in connective tissue + skin)
• how is the beta pleated sheet stabilised

  by hydrogen bonds
• give an example of a beta pleated sheet

  the protein silk
• what bonds do both the beta pleated sheet and alpha helix have

  peptide bonds