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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.
The R groups is the only part that differs from amino acid to amino acid and thus defines the amino acid. A nucleic acid is a genetic molecule. DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are nucleic acids.They are polynucleotides, made up of a phosphate-sugar backbone and nitrogenous bases of which there are four types: adenine, thymine (uracil in RNA), cytosine and guanine.he R groups is the only part that differs from amino acid to amino acid and thus defines the amino acid. A nucleic acid is a genetic molecule. DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are nucleic acids.