For viruses to multiply, they usually need the support of the cells they infect. In many cases, only in their host’s nucleus can they find the machines, enzymes and building blocks with which they can multiply their genetic material before infecting other cells. But not all viruses find their way into the cell nucleus. Some remain in the cytoplasm and thus must be able to multiply their genetic material independently. To do so, they have to bring their own “machine park.” An essential role in this process is played by a special enzyme composed of various subunits: the RNA polymerase. This complex reads the genetic information from the genome of the virus and transcribes it into messenger RNA (mRNA), that serves as a blueprint for the proteins encoded in the genome.
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Source: Phys.org