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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 current system, the Three Domain System, groups organisms primarily based on differences in ribosomal RNA structure. Ribosomal RNA is a molecular building block for riboso â¦ mes. Under this system, organisms are classified into three domains and six kingdoms.The domains are Archaea, Bacteria, and Eukarya. The kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, and Animalia.ll the other kingdoms consist of eukaryotic organisms that do have structure to their cells. The differences between these eukaryotic kingdoms (plants, animals, and fungi) are based on how they aquire energy to live. Plants make their own energy from sunlight by using photosynthesis.