Chapter 10.7, Problem 10.20CE

Interpretation Introduction

Interpretation:

The two amino acids whose $\text{R}$ group can form hydrogen bond with one another and two amino acids whose $\text{R}$ group cannot hydrogen bond with one another if they are close together in a protein chain or in two adjacent protein chains have to be stated.

Concept Introduction:

When hydrogen atom is connected to a highly electronegative atom like oxygen, nitrogen, fluorine than partial charge separation is generated within the molecule.  The hydrogen atom gets partial positive charge and electronegative atom gets partial negative charge.  The bond formed between hydrogen atom of one molecule and electronegative atom of other molecule is termed as hydrogen bond.