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Viruses have specific proteins on them which only binds to certain receptors, which are present in certain cell's plasma membrane.
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Why most viruses that infect bacteria have tails whereas most viruses that infect animals and plants do not?
they have tails so they can penetrate through the cell walls of bacteria
Why are viruses difficult to target therapeutically?
Viruses use their host's metabolic enzymes and some viruses mutate very quickly so they can easily become resistant to drugs. Viruses are almost biologically inert until they infect a cell.
What does a host cell provide a virus?
A way of replicating itself. Viruses can not replicate themselves because they are, basically, genetic material covered in a protein capsid. So, they must enter a living cell, hijack the reproductive process of the cell and have the cell turn out copies of the viruses genetic material and protein capsid. Then the viruses manufactured in the cell causes lysis of the cell and the viruses emerge to infect more cells. A simplified expexplanation of the lytic cycle.
What might happen to a cell after viruses leave it?
The host cell lyses, which means the host cell burst and is killed.
Why is a lytic infection given that name?
Lytic refers to lysis which means separate in Greek. When a virus has replicated in a cell, the new viruses made in the cell cause the cell to separate or split open so the virus particles can get out and infect more cells and make more viruses.
What does a virus need to make more viruses?
The virus attaches itself to a living cell, Human or another microbe. It then sends in its genetic codes and forces the cell to reproduce more of that code. Eventually the other cells are full of viruses and pop sending more viruses everywhere to then redo the process. It then causes diseases such as aids or chicken pox
Why the body need a defense system?
So viruses or diseases can not infect your body and kill you.
Does freezing meat make it all right to eat if the animal had a disease?
Freezing meat will kill many types of disease causing organisms, but not all of them. Parasites such as worms will be killed, bacteria will be killed, but viruses can survive freezing. Of course, viruses that infect animals usually will not infect people, they tend to be species specific. So your chances are pretty good.
What parts of a computer do viruses infect?
Their are many parts of a computer that viruses infect. Most viruses infect a certain file or program so that whenever that file is run, the virus is also executed. Some viruses called Master Boot Record viruses infect the Master Boot Record of your computer. The Master Boot Record is the partition of your computer first executed when you boot up your computer. When you turn on your computer, it runs all the programs inside the Master Boot Record partition and then passes control to other child processes. Viruses in this class infect the Master Boot Record so that whenever your turn on your computer, the viruses runs at startup too. These viruses are very tricky to find as they hide in a very deep part of your Operating System and manually deleting them could damage your computer.
Why is it difficult in establishing the etiology of cancer?
Viruses can infect a cell (s) without causing cancer, sometimes cancer can occur long after an infection takes place. Cancer is not contagious, so difficult to track.
Can a virus change the normal activity of a cell?
Viruses are non-living, and require a host cell in order to survive and function. So the answer to your question is yes, that is exactly what a virus does -- it takes over a healthy cell and uses its machinery to do its dirty work, eventually ending up in the death of the healthy cells.
Are viruses unicellular?
Viruses are DNA wrapped up in protein.
