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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.
Template:Hatnote Template:Pp-move-indef Template:Paraphyletic group Monera (Template:IPA-en Template:Respell) is a kingdom that contains unicellular organisms without a nucleus (i.e., a prokaryotic cell organization), such as bacteria. The kingdom is considered superseded. The taxon Monera was first proposed as a phylum by Ernst Haeckel in 1866. Subsequently, the taxon was raised to the rank of kingdom in 1925 by Ãdouard Chatton.