Ribosome
It is difficult because viruses lack the ability to replicate themselves and theey lacks energy metabolism and other pathways that living things have. Viruses are totally depending on their host. If they want to replicate, they have to infect the host.
false
a computer program taht replicate itself & infect copmuter for distructive purpose
Yes, viruses can mutate to infect new species.
Bacteriophage
Most of the time, a mutation in a virus results in better ability to infect a host cell and more resistance to the host cell's defenses.
Because the living organism has to replicate the DNA that the virus infects the host with. It can't do this if it is a dead organism.
Viruses are placed in a separate group because they are not considered living organisms. They lack the ability to carry out metabolism or reproduce on their own, and they must infect host cells in order to replicate. This distinguishes them from other organisms classified in the biological system.
They can infect the body and make you sick
The Melissa virus is a mass-mailing macro virus. It can effect email that is sent and infect the computer when the email is opened.
Yes. anything you smoke or inhale can infect your lungs.
No, 'Infect' is a replacement effect, ie, it does something 'instead' of what normally happens. A creature with Infect places -1/-1 counters instead of doing damage to creatures, and places Poison Counters instead of doing damage to players (it can hit a Planeswalker normally, no part of its replacement effect stops it).