Chapter 27 – Viruses
15. Integrase inhibitors work by:
True / False Questions
16. Tetracycline is effective against viruses because it disrupts the action of the viral
ribosomes.
17. The pneumonia caused by the influenza virus results from the accumulation of fluid and
cell debris in the lungs. This occurs during the lysogenic life cycle of the virus.
Multiple Choice Questions
Chapter 27 – Viruses
18. Plasma from a sick mouse is filtered across a membrane that has a 200 nm pore size. If
the filtrate is still infectious when injected into a healthy mouse, then the pathogen is most
likely a(n):
Clarify Question
•
What is the key concept addressed by the question?
•
What type of thinking is required?
Gather Content
•
What do you already know about virus size?
Choose Answer
•
Given what you now know, what information and/or problem solving approach is most
likely to produce the correct answer?
Reflect on Process
Chapter 27 – Viruses
Fill in the Blank Questions
19. Viruses are ______ -coated fragments of DNA or RNA.
20. A ____________ can contain DNA or RNA as its genetic material, but not both.
21. Outside the protein sheath, many viruses have a(n) _______ made of protein, lipid, and
carbohydrate.
Chapter 27 – Viruses
22. Viruses can ________ only after they have entered a host cell, and only by using the
host’s cellular machinery.
23. _____________ infects the CD4+ T cells, which are required for normal immunity.
24. The SARS virus is a member of the family of viruses called ____________.
Multiple Choice Questions
Chapter 27 – Viruses
25. Most viruses form a capsid around their nucleic acid core. This capsid is composed of
26. Virulent viruses multiply within infected cells and eventually
27. Recently a class of infectious proteins with no associated nucleic acid have been
identified. They are referred to as
Chapter 27 – Viruses
28. The HIV virus is considered a(n) ______ virus, because after getting integrated into the
host cell chromosomes, it does not begin replicating immediately.
29. Each HIV particle possesses a ___________ on its surface, called gp120, that precisely
binds to a protein, called CD4, that is found on the surfaces of the immune system cells called
macrophages and T cells.
30. Viruses are characterized by all of the following except
Chapter 27 – Viruses
31. All of the following are diseases caused by viruses except
32. Phages are viruses that can infect
33. A layer of lipoprotein and glycoprotein that covers the outer surface of some viruses is
the
Chapter 27 – Viruses
34. Viruses that become established as stable parts of the host cell genome are called
35. Prions are
36. Which of the following is a virus with an icosahedral head, a capsid that contains
primarily three proteins, a connecting neck with a collar and long whiskers, a long tail and a
complex base plate?
Chapter 27 – Viruses
37. Benign Vibrio cholerae becomes pathogenic by all of the following steps except
38. The infection cycle of HIV includes all of the following steps except
39. HIV studies revealed that it is closely related to
Chapter 27 – Viruses
40. The onset of AIDS is often accompanied by
41. An example of an “emerging virus” (a virus in a new host) with a lethality rate in excess
of 50% is
42. HIV infects cells by recognizing the cell-surface markers with its own
Chapter 27 – Viruses
43. Mad cow disease is caused by a
44. Nearly all viruses are constructed of
45. A scientist is studying the lysogenic cycle of the lambda 1 phage of Escherichia coli. This
means that she is investigating
Chapter 27 – Viruses
46. If a virus enters the lytic phase in a host’s cell, it will cause the host cell to
47. Scientists have demonstrated that the cholera bacteria, Vibrio cholerae, can exist as a
rather harmless form or, by phage conversion, can exist as a disease-causing, virulent form.
This conversion is caused by
48. The specific white blood cells that HIV attaches to are the ____________ cells.