Proteins

• What are proteins made from?

  Amino acids
• What is the general structure of an amino acid?

  A central carbon, hydrogen atom, amino group, carboxyl group, and variable R group
• What is a dipeptide?

  Two amino acids bonded together
• What type of bond forms between amino acids?

  A peptide bond
• What are the four levels of protein structure?

  1. Primary structure: Sequence of amino acids
  2. Secondary structure: Folding into alpha helix or beta pleated sheet
  3. Tertiary structure: Further folding into a unique 3D shape
  4. Quaternary structure: More than one polypeptide chain
• What is the test for proteins?

  Add biuret reagent; a positive result turns from blue to purple.