Concept #1: Peptide Group vs. Peptide Bond

Practice: Which atoms are not part of the peptide group?

Concept #2: Conformations of the Peptide Group

Practice: Why are atoms of the peptide group planar?

Practice: For each figure, highlight each bond with limited rotation & determine the conformation of each peptide group.

A. 

B. 

C. 

Concept #3: Limited Flexibility of the Peptide Backbone

Practice: In the diagram below, the square plane drawn behind the protein molecule indicates the: