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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.
Proteins ï½ Amino acids ï½ Monomers of proteins ï½ Compounds of nitrogen atoms, oxygen atoms, carbon atoms, and hydrogen atoms ï½ Have an amino group and a carboxyl group ï½ Letâs see what they look likeâ¦. Amino Group NH 2 Carboxyl Group COOH The R Group refers to the ârest ofâ the molecule.