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11. Which one of the above tripeptides contains the largest number of nonpolar R groups? A. A B. B C. C D. D E. E 12. In the diagram below, the plane drawn behind the peptide bond indicates the: A) absence of rotation around the CN bond because of its partial double-bond character. B) plane of rotation around the CaN bond. C) region of steric hindrance determined by the large C=O group. D) region of the peptide bond that contributes to a Ramachandran plot. E) theoretical space between 180 and +180 degrees that can be occupied by the and angles in the peptide bond