Compare and contrast the bacteriophage lytic cycle and lysogeny by addressing (1) the rate of replication of the viral genome, (2) production of virions, and (3) effect on the host cell.

What features distinguish the seven major categories of viruses?

The outer surface of a virion consists of either a membranous envelope or a protein capsid. How does the outer surface correlate with a virus's mode of exiting a host cell?

RNA viruses require their own supply of certain enzymes becausea. host cells rapidly destroy the viruses.b. host cells lack enzymes that can replicate the viral genome.c. these enzymes translate viral mRNA into proteins.d. these enzymes penetrate host cell membranes.

Compare and contrast the bacteriophage lytic cycle and lysogeny by addressing (1) the rate of replication of the viral genome, (2) production of virions, and (3) effect on the host cell.

DRAW IT Redraw Figure 19.8 to show the replicative cycle of a virus with a single-stranded genome that can function as mRNA (a class IV virus).

If you come down with the flu, should your physician prescribe an antibiotic for you? Explain why or why not.

If you come down with the flu, should your physician prescribe an antibiotic for you? Explain why or why not.

Of the viruses highlighted in Section 33.4, predict which of the following would be able to make viral proteins if nothing more than its genome were injected into a suitable host cell.a. pea mosaic ([+]ssRNA) virusb. bluetongue (dsRNA) virusc. measles ([−]ssRNA) virusd. human immunodeficiency (RNA reverse-transcribing) virus