Proteins

• What is the structure of an amino acid?

  • NH2CHCOOH
  • One amino group RNH2
  • One carboxylic acid group RCOOH
  • One variable R group
  • One RCH group
  • 20 different amino acids

  
• What is the structure of a primary protein?

  • Amino acids joined by peptide bonds 
• What is the structure of a secondary protein?

  • Peptide bonds
  • Alpha helix coils
  • Beta pleated sheets fold
  • Hydrogen bonds
• What is the structure of a tertiary protein?

  • Peptide bonds
  • Alpha helix coils
  • Beta pleated sheets fold
  • Hydrogen bonds between r groups
  • Ionic bonds
  • Disulfide bridges by R groups containing sulfur, strong
• Fibrous proteins

  • Long + thin
  • Insoluble
  • Keratin, hair, collagen, connective tissue
• What is the structure of a quaternary protein?

  • Two or more polypeptide chains
  • Peptide bonds
  • Alpha helix coils
  • Beta pleated sheets fold
  • Hydrogen bonds between r groups
  • Ionic bonds
  • Disulfide bridges by R groups containing sulfur
• What is a peptide bond?

  • A bond between 2 amino acids formed by a condensation reaction between the carboxylic acid group and amino group
• What is the test for proteins?

  • Biurets solution + sodium hydroxide
  • Blue -> purple
• What is the structure and function of globular proteins?

  • They are spherical, soluble and are used in enzymes, myoglobin and haemoglobin