Homework answers / question archive / Texas Southern University - BIOL 347 Chapter 14 Viruses, Prions, and Viroids: Infectious Agents of Animals and Plant Multiple Choice Questions 1)The nucleocapsid is composed of A

Texas Southern University - BIOL 347 Chapter 14 Viruses, Prions, and Viroids: Infectious Agents of Animals and Plant Multiple Choice Questions 1)The nucleocapsid is composed of A

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Texas Southern University - BIOL 347

Chapter 14

Viruses, Prions, and Viroids: Infectious Agents of Animals and Plant

Multiple Choice Questions

1)The nucleocapsid is composed of

A. DNA and RNA and protein.

2. DNA or RNA and protein.
3. protein located in the nucleus.
4. nucleic acid in the ribosome.

 

 

2. The term "segmented" refers to viruses that

A. may contain several pieces of RNA.

B. have an icosahedral-shaped capsid.

C. are linked together before budding out.

D. have an envelope.

 

 

 

3. Animal viruses are divided into a number of families whose names end in

A. - virus.

2. - viridae.
3. - viscous.
4. - eieio.

 

4. The family to which the Rhinovirus belongs is the

A. Picornaviridae.

B. Enterovirus.

C. Enteroviridae.

D. Picornavirus.

 

 

 

 

 

 

5. In addition to lysis, animal viruses may exit the host cell by

A. extrusion.

2. budding.
3. fission.
4. fusion.

 

 

 

6. In latent infections, the virions are

A. constantly produced.

2. only produced during reactivation.
3. produced slowly.
4. continually being slowly budded out.

 

 

 

 

 

7. The changes that occur in virally-infected cells are characteristic for a particular virus and are referred to as the

A. cytopathic effect.

B. phenotypic effect.

C. genotypic expression.

D. cytology.

 

8. After growth in tissue culture, the infected cells lyse and the virus may be harvested from

A. the liquid supernatant after centrifugation, the lysate.

B. the remainder.

C. the quantal layer.

D. the monolayer.

 

 

 

9. The approximate viral concentration of a sample may be determined by

A. quantal assay.

B. endpoint assay.

C. the titer.

D. the lysate assay.

 

 

10. Which of the following is not a characteristic of normal cells?

A. They grow as a monolayer.

2. They grow as multiple layers.
3. They undergo a limited number of divisions and then die.
4. They stick tightly to the surface of glass culture dishes.

 

11. Plant viruses enter the host plant via

A. wound sites.

B. specific receptors.

C. nonspecific receptors.

D. seeds.

 

 

 

 

12. Viroids characteristically are composed of

 A. ssRNA.

B. dsRNA.

C. ssDNA.

D. dsDNA.

 

13. Viroids cause disease in

A. animals.

2. plants.
3. bacteria.
4. fungus.

 

 

 

 

Matching Questions

 

14. Which of the following best matches the description:

1. Influenza

2. HIV

3. Rabies

4. Herpes

5. Polio

6. Rotavirus

7. Measles

8. Rhinovirus

 

 

True / False Questions

 

15. Bacteriophage, unlike animal viruses, often have special viral-specific enzymes carried in the capsid which enter the host cell at the same time as the nucleic acid.

 

16. The structure of plant, animal and bacterial viruses are each, fundamentally, very different from one another.

 

17. Capsids are made of a number of capsomeres which are covalently bonded to one another.

 

18. Naked and enveloped viruses both may enter the host via endocytosis.

 

19. All viruses must separate the nucleic acid from the capsid before replication.

 

20. If a virus utilizes a lytic life cycle of reproduction, it will not induce tumors.

 

21. Viruses that cause acute infection result in productive infections.

 

22. Plant viruses may be passed from generation to generation of an insect vector

 

23. Electron microscopy is useful for counting viruses and distinguishing between infective and non-infective virions.

 

24. Infective and non-infective viruses may be distinguished by growth on MacConkey's agar.

 

 

Essay Questions

 

25. What is a viroid?

 

26. How could a viroid cause disease in plants?

 

27. Compare and contrast viroids and prions.

 

28. Explain how the virulence of the human influenza virus may change.