Chap 6 HW – Microbiology – Flashcards
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Unlock answers1. Viruses have all the following except:
a. definite shape b. metabolism c. genes d. ability to infect host cells e. ultramicroscopic
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b. metabolism |
2. Host cells of viruses include:
a. human and other animals b. plants and fungi c. bacteria d. protzoa e. all of the choices are correct |
e. all of the choices are correct
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3. The core of every virus particle always contains:
a. DNA b. capsomer c. enzymes d. DNA and RNA e. either DNA or RNA |
e. either DNA or RNA |
4. Which of the following represents a virus family name?
a. Herpes simplex virus b. Herpesvirdae c. Picornavirus d. Enterovirus e. Hapatitis B virus
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b. Herpesvirdae
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5. Classification of viruses into families involves determining all the following characteristics except:
a. type of nucleic acid b. type of capsid c. presence of an envelope d. biochemical reactions e. number of strands in the nucleic acid
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d. biochemical reactions |
6. Which of the following is not associated with every virus?
a. envelope b. capsomeres c. capsid d. nucleic acid e. genome |
a. envelope |
7. Helical and icosahedral are terms used to describe the shapes of a virus:
a. spike b. capsomere c. envelope d. capsid e. core |
d. capsid |
8. Viruses:
a. cannot be seen in a light microscope b. are prokaryotic c. contain 70S ribosomes d. undergo binary fission e. all of the choices are correct |
a. cannot be seen in a light microscope |
9. All of the following pertain to virus envelopes except:
a. gained as a virus leaves the host cell membrane b. gained as a virus leaves the nuclear membrane c. contain special virus proteins d. help the virus particle attach to host cells e. located between the capsid and nucleic acid |
e. located between the capsid and nucleic acid |
10. Virus capsids are made from subunits called:
a. envelopes b. spikes c. capsomeres d. prophages e. peplomers |
c. capsomeres |
11. Viruses acquire envelopes around their nucleocapsids during:
a. replication b. assembly c. adsorption d. release e. penetration |
d. release |
12. Which is incorrect about prophages?
a. present when the virus is in lysogeny b. formed when viral DNA enters the bacterial chromosome c. replicated with hos DNA and passed on to progeny d. cause lysis of host cells e. occur when temperate phages enter host cells |
d. cause lysis of host cells |
13. The correct sequence of events in viral multiplication is
a. penetration, replication, maturation, adsorption, assembly, release b. replication, penetration, maturation, assembly, absorption, release c. adsorption, penetration, replication, maturation, assemble, release d. assembly, maturation, replication, release, penetration, adsorption e. adsorption, release, maturation, replication, assembly, penetration |
c. adsorption, penetration, replication, maturation, assembly, release |
14. The event that occurs in bacteriophage multiplication that does not occur in animal virus replication is:
a. adsorption to the host cells b. injection of the viral nucleic acid into the host cell c. host cell synthesis of viral enzymes and capsid proteins d. assembly of nucleocapsids e. replication of viral nucleic acid |
b. injection of viral nucleic acid into the host cell |
15. These structures are used by bacteriophages to attach to host cell receptors:
a. sheath b. tail fibers c. nucleic acid d. capsid head e. none of the choices are correct |
b. tail fibers |
16. During lysogeny, an inactive prophage state occurs when the viral DNA is inserted into the ____________ |
host chromosome |
17. The virus-induced, specific damage to the host cell that can be seen in a light microscope is called:
a. lysogeny b. budding c. plaques d. cytopathic effects e. pocks |
c. plaques |
19. Viruses that cause infection resulting in alternating periods of activity with symptoms and inactivity without symptoms are called:
a. latent b. oncogenic c. prions d. viroids e. delta agents
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a. latent |
20. Which of the following is a type of cytopathic effect?
a. inclusions in the nucleus b. multinucleated giant cells c. inclusions in the cytoplasm d. cells round up e. all of the choices are correct |
e. all of the choices are correct |
20. Visible, clear, well-defined patches in a monolayer of virus-infected cells in a culture are called:
a. lysogeny b. budding c. plaques d. cytopathic effects e. pocks |
c. plaques |
23. Viruses are ultramicroscopic because they range in size from 2 um to 450 um. T/F |
False |
21. Host range is limited by:
a. type of nucleic acid in the virus b. age of the host cell c. type of host cell receptors on cell membrane d. size of the host cell e. all of the choices are correct |
c. type of host cell receptors on cell membrane |
22. Uncoating of viral nucleic acid:
a. does not occur in bacteriophage multiplication b. involves enzymatic destruction of the capsid c. occurs during penetration in the multiplication cycle d. occurs before replication e. all of the choices are correct |
e. all of the choices are correct |
| 24. Prophages can be activated into viral replication and entering the lytic cycle. T/F |
True |
24. Spikes are glycoproteins of the virus capsid.
a. True b. False |
B. False |
| 26. A specific animal virus has the ability to attach to and enter almost any animal host cell. T/F |
False |
| 27. Bacterophages do not undergo adsorption to specific host cell receptors prior to penetration. T/F |
False |
| 28. When a virus enters a host cell, the viral genes redirect the genetic and metabolic activities of the host cell. T/F |
True
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| 29. Viral spikes are inserted into the host cell membrane before budding or exocytosis. T/F |
False |
| 30. A _____________is the protein shell around the nucleic acid core of a virus. |
capsid |
| 31. Viruses that infect bacteria are specifically called ______________. |
phage |
| 32. Viruses with _______sense RNA contain the correct message for translation, while viruses with __________sense RNA must first be converted into a correct message. |
+ve, -ve |
| 33. A naked virus does not have an ____________. |
envelope |
34. In general, most DNA viruses multiply in the host cell's ________, whil most RNA viruses multiply in the host cell's ___________.
a. nucleus, cytoplasm b. cytoplasm, cell membrane c. cell membrane, cytoplasm d. cytoplasm, nucleus e. nucleus, endoplasmic reticulum |
a. nucleus, cytoplasm |
