Which of these is the best description of a virus?
A. A noncellular living organism B. One of the smallest bacteria known C. A member of the kingdom Virusae D. A cell at the boundary between living and nonliving things E. Chemical complexes of RNA or DNA protected by protein
The correct answer to this is E. There are times when just one cell will turn bad and it will be reproduced inside the living host. For example, people who are suffering from colds may get that from just one cell that has managed to multiply rapidly in a short amount of time. This has the ability to copy itself perfectly well and the effect on people is not that good.
Those who are exposed to the virus would usually begin to see the effects in a short amount of time. The body is usually unable to kill the cell the starts it because it is protected by protein.