Chapter 19—Viruses and Prokaryotes Key
1. Viruses
2. A virus consists of ____ and ____.
3. Viruses
4. The most widely held hypothesis says that viruses originated from
5. In the lytic cycle, after a virus attaches to a host cell which of the following happens next?
6. In the lytic cycle, after viral nucleic enters the host cell, which of the following happens next?
7. Which of the following statements concerning the lytic cycle is FALSE?
8. The lysogenic cycle differs from the lytic cycle in that in the lysogenic cycle
9. A prophage is
10. Which of the following statements concerning the lysogenic cycle is FALSE?
11. By definition, a retrovirus is
12. Which of the following statements concerning animal viruses is FALSE?
13. Plant viruses
14. A viroid is a short
15. Which of the following statements concerning viroids is FALSE?
16. A prion is
17. Which of the following statements concerning prions is FALSE?
18. Which of the following statements concerning prokaryotes is FALSE?
19. The cell shape called coccus is a
20. Prokaryotic cells
21. Prokaryotes have
22. Which of the following statements concerning the prokaryotic capsule is FALSE?
23. The cell wall of prokaryotes
24. The prokaryotic plasma membrane
25. Most functions carried out by elaborate systems of internal membranes in eukaryotes are carried out by the
____ of prokaryotes.
26. The genetic material of prokaryotes
27. Plasmids
28. Pili
29. Which of the following statements concerning endospores is FALSE?
30. Prokaryotes that neither harm nor help their hosts are called
31. Prokaryotes that photosynthesize in the same way as algae and plants are the
32. Chemosynthetic prokaryotes
33. Photosynthesis in photosynthetic bacteria other than cyanobacteria
34. Cells that require atmospheric oxygen for cellular respiration are called
35. Obligate anaerobes can carry on respiration only in the absence of
36. Prokaryotes can sometimes exchange genetic material by
37. Which of the following statements concerning a biofilm is FALSE?
38. Arachaea differ from bacteria in that archaeae
39. Archaebacteria are adapted to extreme environments such as that existing today in
40. Cell walls of gram-positive bacteria
41. The antibiotic penicillin
42. Nitrogen-fixing bacteria
43. Which of the following causes leaf spots, cankers, wilts, and seedling death in plants?
44. Some of these corkscrew-shaped bacteria cause Lyme disease.
45. An example of a cyanobacterium is
46. Certain members of the ____ cause tetanus and other members cause botulism.
47. The fecal coliform test is used to test for the presence of
48. Who am I? I am a spherical bacterium occurring in chains, and I cause strep throat.
49. Bacteria are ecologically important because
50. Viruses belong in the domain Archaea.
51. Viruses are single-celled organisms.
52. Viruses are thought to have originated from fragments of DNA or RNA that “escaped” from cellular
organisms.
53. In the lytic cycle, the viral DNA is integrated into the host DNA.
54. A virus in the lysogenic state can revert to a lytic state.
55. Most plant viruses are DNA viruses.
56. Cures exist for most plant viral diseases.
57. A prion is a protein.
58. The cell wall of most prokaryotes is composed of cellulose, like plants.
59. Some prokaryotes form colonies or filaments that contain specialized cells.
60. Normally, prokaryotes can survive without their cell walls.
61. The prokaryotic chromosome is tiny, only about as long as the cell itself.
62. Prokaryotic flagella are structurally identical to eukaryotic flagella.