what's a virus?

Answer 1

Rebel DNA is one way to think of a Virus. Its totally inactive until it comes in contact with the correct sequence of DNA. Then it triggers and spliced its own DNA string into a host cell. This turns the infected cell into a factor that produces Virus copies until it burns out is dammaged by the viruses burting the cell wall.

Its not really a living organism so much as a natural occuring organtic machine. They dont, breath, eat, move, or have any other function then to pass their DNA message to the next host.

The DNA message in the Virus can be damaged and change over time in what we think of as a mutation allowing the virus to have a diffrent effect on the host animal or plant or allowing it to effect a difrent species.

Unlike bacterial infections which are really just simple often one celled cratures, Viruses are much more difficult to kill. They can endure much greater enviromental extremes before being destroyed.

Answer 2

there are two types of viruses, a retrovirus has RNA instead of DNA in it, and then there's a regular virus, DNA. Viruses don't eat or grow, and can't reproduce by themselves just keep going after cells to do it for them by somehow implanting their own dna or rna if they're retroviruses. They are half dead types of things that just mess with other cells for who knows what reason. AIDS is a retrovirus, has RNA.

Answer 3

Very small parasites that reproduce in the host.

Answer 4

check google, check your science textbook, ask a teacher.
idiot!