why do they claim that virus is not a living organism?

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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ESTRANGED
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why do they claim that virus is not a living organism?

Post by ESTRANGED » Fri Dec 02, 2005 12:11 am

as far as i know all living organisms have got 7 characteristics. virus fulfils just one of them which is reproduction.

so is this the point of the division; that it fulfils just one and not the rest of the characteristics? i have read somewhere that some scientists believe that its a freestyler genetic material escaped from the main organism... sorry cannot express my self correctly. hope i was clear enough.... is just a question that i ve had for years in my mind but didnt have a person to discuss about it. thank you! :D

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mith
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Post by mith » Fri Dec 02, 2005 3:51 am

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Poison
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Post by Poison » Fri Dec 02, 2005 6:48 am

We discussed this many times. I used to say what you say too but I'm convinced now.
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Post by scottyiu » Wed Dec 07, 2005 11:25 am

Then why is bacteria counted as a living orgainsm?
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Post by victor » Wed Dec 07, 2005 12:44 pm

ecause it can do a metabolism y itself...no need host to maintain it's life span....
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Post by scottyiu » Wed Dec 07, 2005 1:32 pm

Thanks for replying. However, i still don't get what you meant and what is metabolism?
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Post by Poison » Wed Dec 07, 2005 5:43 pm

basically you can set the criteria as cellular respiration.
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This might help you decide!

Post by abbielehman » Tue Apr 18, 2006 5:42 am

There are 4 basic criteria that all living organisms meet, as I learned from my rockin' Bio prof:
1)All living things obey the laws of chemistry and physics.
2)All living things use DNA.
3)All living things require energy.
4)All living things are made up of cells.
Viruses meet criterian 1 and 2, but not 3 and 4. They are not made up of (a) cell(s), they only have a protein coat and genetic info, such as DNA or RNA. They also do not require energy to thrive. They survive by hijacking a cell, and in turn the infected cell reproduces and assembles more virus with its own energy. But a virus does have DNA/genetic info. and as far as I know obeys the laws of chemistry and physics. So it's 2:2-you could argue either way...Hope that helps! :D Peace out!
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Post by kiekyon » Tue Apr 18, 2006 1:23 pm

my criteria for living things
1. They have the capacity to replicate themselves.
2. They have enzymes, and complex proteins essential for the chemical reactions needed for life.
3. Have a membrane that separates the cell from the environment and gives it a distinct chemical identity

With regards to viruses, they are unable to replicate themselves without
the aid of a host cell. Out side of the cell they are just inert particles. The only way in which they can replicate is to invade a cell, take over its replication machinery, and use it to produce more virus. In essence most viruses are just nucleic acid (RNA or DNA) surrounded by protein.

Some viruses to have their own enzymes but the enzyme itself is not active until the virus enters its host cell. Outside of the cell, they usually do not have a metabolism of their own.

With this in mind, scientists do not consider viruses to be living. They
are thought of as inert particles and only function and replicate with the
aid of a host cell.

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Post by Ultrashogun » Sat Apr 29, 2006 9:42 am

Viruses are organized particles.

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