Host cells carrying temperate viruses are called lysogens. Describe how a single protein like the lambda repressor can act both as an activator and a repressor. Section 8.14 Multiplication of animal viruses differs in significant ways from the multiplication of bacterial viruses, because of differences in compartmentation of macromolecule synthesis in eukaryotes as opposed to prokaryotes. Not all infections of animal host cells result in cell lysis or death. In some cases, latent infection occurs, the virus remaining infectious, but dormant inside the host, and appearing spontaneously at a later time.
Some animal viruses cause transformation of host cells to the cancerous state.
Contrast the mechanisms by which animal viruses enter cells with those used by bacterial viruses. In small RNA viruses such as polio, the viral RNA acts directly as a single messenger RNA, causing the production of a long polyprotein that is broken down by enzymes into the numerous small proteins necessary for nucleic acid multiplication and virus assembly. As important negative-strand virus is influenza virus. Most double-stranded DNA animal viruses replicate in the nucleus. Some viruses causing cancer and other conditions in animal cells are double-stranded DNA viruses.