Answers to End-of-Chapter Questions
CHAPTER 13 Characterizing and Classifying Viruses, Viroids, and Prions
Multiple Choice
Matching
Visualize It!
1. See Figure 13.8, pg 390.
Short Answer
2. The five phases of a generalized lytic replication cycle (Figure 13.8) are (1) attachment to
3. It is difficult to treat viral infections because viruses depend on cellular enzymes to
5. Lysis ruptures the cell relatively quickly, whereas budding allows an infected cell to
1.
Structure
Bacterium
Virus
cell membrane present absent
Microbiology with Diseases by Body System, 5e
9. Viruses have proteins or glycoproteins on their outer capsid or envelope surfaces that are
Critical Thinking
2. The advantages of the lytic cycle to bacteriophages are a reproduction cycle time faster
3.
Answers to End-of-Chapter Questions
6. When a virus whose genome is like mRNA sense strand RNA (+ssRNA) infects a
8. Taxonomy of living organisms is based traditionally on similarities in structure and
function, including metabolic and developmental processes. Viruses have no metabolic
10. The infecting RNA of RNA phages can be used immediately for producing viral proteins,
11. The DNA copy of the infecting RNA produced by reverse transcriptase is much more
stable than RNA and can serve as a template for many more rounds of transcription than
Microbiology with Diseases by Body System, 5e
Concept Mapping
1. Attachment