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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.
Ribosomal RNA is a molecular building block for ribosomes. 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.The Archaea and Bacteria domains contain prokaryotic organisms.he current Three Domain System is the best organizational system we have now, but as new information is gained, a different system for classifying organisms may later be developed. By Regina Bailey. The Three Domain System, developed by Carl Woese, is a system for classifying biological organisms.