Exam 9: Viruses of Archaea

Even though the two archaeal viruses HHPV-1 and HRPV-1 are clearly related to each other, based on genome and virion structures, they have one major difference.Which of the following describes this difference?

The extrusion of the tails on the Acidianus two-tailed virus requires which of the following?

Even though many of the viruses that infect archaeal cells do not kill their host, they often do which of the following?

Infection of the archaeal cell Acidianus with the virus ATV at the suboptimal temperature of 75ᵒC leads to a productive lytic infection rather than lysogeny.

The filaments attached to one end of the Sulfolobus spindle-shaped virus 1 are thought to be involved in which of the following processes?

Into which of the following genes in the host cell genome does the archaea virus SSV-1 integrate its genome?

Which of the following terms specifically describes archaeal organisms that can grow above 80ᵒC?

What is unusual about the virion of the Acidianus two-tailed virus?

Archaea cells contain a nucleus like eukaryotic cells.

Some of the viruses that infect host cells in the euryarchaeota phyla have similar virion structures as the head-tail viruses in the Myoviridae and Siphoviridae families.

What information was used to identify the three domains of life?

Most archaea viruses resemble bacteriophages with an icosahedral head and a helical tail.

In comparing the genomes of the viruses that infect archaeal cells, very few of the viral genomes have genes encoding an identifiable DNA polymerase.Give two possibilities that explain this observation.

Which of the following is a description of an IS element?

Many of the viruses that infect archaeal cells primarily carry out a lysogenic infection.Even if they do enter a productive infectious cycle, they can release new virions without killing the host cell.What might be the evolutionary advantages of these lifestyle features?

Which of the following techniques can be used to induced an integrated copy of the archaea virus SSV-1 to begin expressing viral genes?

Archaea are singled-celled microorganisms that share which of the following characteristics with eukaryotic cells?

The archaea virus SSV-1, which infects a host organism that lives at 80ᵒC, has a positively supercoiled genome.What is the advantage of this?

Which of the following characteristics is common to many of the viruses that infect archaeal cells and distinguishes them from the phages that infect bacteria.

Viruses that infect archaeal cells have been observed to have all of the following virion shapes EXCEPT: