Which of the following describes the mechanism used by togaviruses to switch from synthesizing negative-strand genomes to making positive-strange genomes?
A) Phosophorylation of the polymerase protein. B) Dephosphorylation of the polymerase protein. C) Glycosylation of the polymerase protein. D) Methylation of the polymerase protein. E) Proteolytic cleavage of the polymerase protein.