Microbiology Chapter 13 Review Questions

A clear zone of phage infection in a bacterial lawn is: a. a prophage b. a plaque c. naked d. a zone of inhibition - b. a plaque A naked virus: a. has no membrane envelope b. has injected its DNA or RNA into a host cell c. is devoid of capsomeres d. is one that is unattached to a host cell - a. has no membrane envelope A virus that is specific for a bacterial host is called a: a. phage b. prion c. virion d. viroid - a. phage Anothe rname for a complete virus is: a. virion b. viroid c. prion d. capsid - a. virion bacteriophage - a virus that infects a bacterium benign tumor - harmless neoplastic cells cancer - invasive neoplastic cells capsid - protein coat of virus envelope - a membrane on the outside of the virus prophage - inactive virus within a bacterial cell provirus - dormant virus in a eukaryotic cell retrovirus - transcribes DNA from RNA uncoating - removal of capsomeres from a virion virion - complete viral particle When a eukaryotic cell is infected with an enveloped virus and sheds viruses slowly over time, this infection is: a. called a lytic infection b. a prophage cycle c. called a persistent infection d. caused by a quiescent virus - c. called a persistent infection