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virus's

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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virus's

Postby Mr Joe » Tue Dec 26, 2006 5:57 am

ive read over and over how virus's arent considered living..........why?
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Postby destiny » Tue Dec 26, 2006 6:10 am

viruses (n.) Any of various simple submicroscopic parasites of plants, animals, and bacteria that often cause disease and that consist essentially of a core of RNA or DNA surrounded by a protein coat. Unable to replicate without a host cell, viruses are typically not considered living organisms.

--- American Heritage Dictionary of the English Language – Fourth Edition


It depends on what you mean by the word 'living'.

Check out http://www.cs.unc.edu/Research/nano/ed/virus.html
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Postby monny » Tue Dec 26, 2006 8:40 am

Viruses are not considered living bcoz they cannot live independently.Yes,they can multiply and replicate but thats only when they r inside host cell.Outside, they r as good as simple chemical substances.
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Postby Poison » Tue Dec 26, 2006 9:43 pm

Search please. You will find what you want.
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How charged with punishment the scroll
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Postby Darby » Wed Dec 27, 2006 1:10 am

They break several of the "Life Rules," and you have to decide how important the rules are to you. I'd say more than 50% of biologists, when pushed, would consider them alive. I have no actual data to support that claim.

But -

- They're not truly cellular, even if they have membrane coating swiped from the host cell.

- Outside of the host cell, they have no real metabolism.

- Once formed, they neither grow nor develop.



The reproduction thing doesn't hold up - there are limitations to many parasites that no one would consider not alive that pretty much match a virus.
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Postby sachin » Tue Jan 02, 2007 5:59 pm

Viruses are just complex molecules........ That serves as vectors......

But my question is....

Why were Viruses had Evolved?
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Postby jimmystang » Tue Jan 02, 2007 10:59 pm

hmm... but viruses do evolve
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Postby jimmystang » Tue Jan 02, 2007 10:59 pm

oops, i guess sachin had asked the same question :oops:
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Postby sachin » Wed Jan 03, 2007 5:02 pm

jimmystang wrote:oops, i guess sachin had asked the same question :oops:


I want to ask......

Why they come into existance.??......... :?:

I m asking "Why" not "How" :o (since I know how :lol: )
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Postby MrMistery » Thu Jan 04, 2007 10:07 am

there is no why.
why does a bacteria survive? does it want to? no. it just does. why(in this case) is not something a biologist can answer. a creationist might have an answer for you, but i doubt it would satisfy you..
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Postby Mr Joe » Tue Jan 09, 2007 8:09 pm

how bout this. ill play devils advocate a little :)
how is a virus non living if it has DNA ?
this is what leads me to beleive there living, because as we all know DNA is the blueprint of LIFE.
one last thing, i know alot of people say its because they cant reproduce with out a host, making them non living
i cant reproduce by myself, being a male i need a female to assist in the process?
just food for thought.
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Postby MrMistery » Tue Jan 09, 2007 8:47 pm

You're not living :p
On a more serious note, having genetic material is a necessary but not sufficient condition for something to be living.
You can't reproduce as an individual, but the species can ;)

This whole living/non-living/in between thing is purely definition. It really doesn't matter. Viruses are what they are regardless if we consider them living or not...
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