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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.
Plasmids-Circular DNA molecules found in prokaryotes. Prokaryotes-Organisms whose cells lack internal organization into organelles and whose genetic material is not contained within a membrane-bound nucleus.Prokaryote flagella-The type of flagellum found in prokaryotes.These flagella are not covered by the cell membrane and move in a spiral motion.lasmids-Circular DNA molecules found in prokaryotes. Prokaryotes-Organisms whose cells lack internal organization into organelles and whose genetic material is not contained within a membrane-bound nucleus.