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#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
This is a chart of the most common chemical functional groups. These functional groups will turn up in later chapters in the biological molecules we study.We recommend studying this chart so you can recognize the functional groups when they appear. R stands for any group of atoms--C,H,N,S--that is attached by a covalent bond to a chemical functional group.e recommend studying this chart so you can recognize the functional groups when they appear. R stands for any group of atoms--C,H,N,S--that is attached by a covalent bond to a chemical functional group.