9: Proteins (part 2: Peptide bond and R groups) Quizellenjmchenry2019-06-26T18:31:27-04:00 Please sign up for the course before taking this quiz. 8: Proteins (part 1: Amino acids) 10: Proteins (part 3: Protein folding) Back to: 9: Proteins (part 2: Peptide bond and R groups)