Name:_________________
Date:__________
1. Many biologist do not consider a virus to be a ______ ________.
2. alone, a virus is not ________, it is not capable of engaging in ____ _________.
3. It is only when the virus invades a ______ ____ that it shows signs of ____.
4. Once viruses invade living cells they can cause _______.
5. The word "virus" is the Latin word for ______.
6. List nine diseases which are caused by viruses.
7. There are more than _ _ _ viruses that are known to cause disease.
8. The viruses which cause disease are called __________ viruses.
9. The word "__________" means capable of causing disease.
10. A virus does not have a ____, but is described as being a ________.
11. A virus has no _______, no __________ and is not surrounded by a ________.
12. Viruses are so small that they pass through _______ that are used to separate bacteria from such liquids as ____ or ____.
13. Only very large viruses can be seen with the _____ __________.
14. Most viruses require an _______ __________ to be seen.
15. Viruses are measured by the ____________.
16. A ___________ is one millionth of a __________.
17. Compared to viruses, bacteria are ______.
18. The existence of viruses were not proven until this _______ when the ________ _________ was invented.
19. The simplest viruses are a core of _______ ____ wrapped in a _______ _____.
20. Sometimes the nucleic acid is _ _ _ and sometimes it is _ _ _.
21. More complex viruses can have ____________, _____, ______ and other substances.
22. The living cell which is invaded by a virus is called the ____ ____.
23. A virus cannot _________ on its own.
24. In the living cell, the virus injects its _ _ _ or _ _ _ into the host cell's _______. This causes the host cell to become a _____ _______.
25. Viruses generally invade only ________ kinds of cells.
26. List five (5) organ systems which viruses specifically invade:
27. The polio virus would attack only _____ _____ in the ______ ____ and _____.
28. The mumps virus infects only ___ ____ of ________ ______ and never any of the ______.
29. Viruses may be a primary cause of ______.
30. There are no _____ which will effectively kill a _____.
31. The human body is capable of making _____ _____ _____ which will destroy most viruses.
32. The problem with viral disease is that these _____ _____ _____ require ____ to be made. During this time the virus can _______ and ____.
33. The drugs which kill _______ kill them by destroying their ____ ________.
34. Since viruses do not have a ____ _______, the best that can be done is to create drugs such as _ _ _ that will slow the ___________ of the virus.
35. Viral disease can be _________ with ________.
36. A _______ is prepared by _________ or _______ the virus and then _________ this virus into the person. The human body does not know that they are ________ or ____, so they _____ on to them to get the ___________ needed to make a _____ _____ ____ which will ____ the virus.
37. Once the white blood cell which can kill a virus has been made, it is _________ to kill the virus should it ______ the body.
38. List seven (7) viral diseases for which there are vaccines:
39. The virus which causes the common cold _______ so quickly and so often that there is no effective _______ for the ______ ____.
40. The AIDS virus is usually contracted through contact with the ______ ______ of an infected person.
41. _____ ________ makes it very unlikely that you will get the AIDS virus from a _____ __________.
42. Many hemophiliacs have AIDS because the _____ used to extract the ________ ______ which allowed them to treat their ________ was not properly screened.
43. When a virus enters the human body and gets into the _____ ______, the ______ ______ goes into action.
44. The virus may be eaten __________ by the various _____ _____ _____ which patrol your body's blood stream.
45. If you lack a white blood cell which will kill the virus, a _______ ____ of white blood cell will ____ into the virus and recognize that it does not belong.
46. Armed with a ___________ of the invader, these white blood cells go to the ______ _____ and tell it to make a _____ _____ _____ which will ____ the invader. In about ___ days, the thymus releases the new _____ _____ ____, which eats the virus through the process called ____________.
47. If you have already had the disease caused by the virus, or if you have been _________ for that disease, you already have the _____ _____ ____ which ____ the virus.
48. You cannot have most viral illnesses _____.
49. There are an estimate _, ___ mutant forms of the virus which creates the ______ ____. If you had had a cold from all of these, you would be ______ to the common cold.
50. The AIDS virus is called _ _ _.
51. _ _ _ attacks the ______ ______ and destroys its ability to do its work.