Exam 3 Micro 18/33

Which of the following statements regarding virus taxonomy is true? Virus classes are well established. Viruses are classified on the basis of the taxonomy of their host organisms. Virus classes are based on the domain of the host organism. Some virus family names are derived from the name of an important member of the family. The species epithet is a latin descriptor of the virion structure.

Which of the following taxa are used for classification of viruses as well as organisms? Class Division Kingdom Family Division, Class, and Family are used in both taxonomic schemes.

Members of a virus family have the same type of nucleic acid. True False

Virus replication results in the death of the cell in ________ infection(s). a lytic a latent a lysogenic a persistent both latent and persistent

Which of the following lists stages of a lytic replication cycle in order, from earliest to latest stages? I. Synthesis II. Assembly III. Attachment IV. Release V. Entry III, V, I, II, IV I, III, V, II, IV I, II, III, V, IV V, III, II, IV, I III, II, V, I, IV

Which of the following is associated with the attachment of a bacteriophage to a bacterial cell? chemical attractions receptor specificity random collisions both chemical attractions and receptor specificity random collisions, chemical attractions, and receptor specificity

The enzyme lysozyme is critical for which of the stages of a bacteriophage T4 infection cycle? entry attachment entry and release synthesis assembly

A(n) ________ is a bacterial virus which is integrated into the host cell DNA. transposon lytic phage prophage insertion phage plasmid

Which of the following events occurs in the lytic cycle of bacteriophage T4 infection but not in the lysogenic cycle? entry attachment digestion of host DNA viral protein synthesis both digestion of host DNA and viral proteins synthesis

Why is lysogeny advantageous to a bacteriophage? it speeds up the viral infection cycle. it allows the bacteriophage to destroy the host cell's DNA. it enables the bacteriophage to take over the cell. the genetic material of the bacteriophage is amplified many times over that seen in a lytic phage. it allows the bacteriophage to infect cells it would not normally infect.