Living or not? (viruses,viroids and prions).

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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Sumanth001
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Living or not? (viruses,viroids and prions).

Post by Sumanth001 » Sun Jun 30, 2013 3:30 am

As our friend said that living organism is the one with protein or nucleic acid or both and imposes its own form and function into another, i would like to say that prions,viroids and viruses ARE LIVING as a prion changes a normal protein to function like itself, a viroid corrupts the normal RNA or DNA TO function like itself and worst of all viruses like HIV have the whole immune system under their control and others undergo mutations to resist the effects of drugs and above all they evolve into living things over millions of years.

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Sumanth001
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Post by Sumanth001 » Sun Sep 08, 2013 10:13 am

what do all of you say???
i need a reply

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Post by Frederic » Tue Sep 17, 2013 3:06 pm

Out the body they act as crystaline non living entities which does not exhibit any form of life but once introduced to the human system they tend to use the cells nucleic acids and other conditions to replicate and multiplier thereby attaining the status of being called a living organism

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JackBean
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Post by JackBean » Tue Sep 17, 2013 3:45 pm

presence of protein or nucleic acid is definitely NOT sufficient to be alive. Otherwise just protein extract would be alive.
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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Sumanth001
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Post by Sumanth001 » Wed Sep 25, 2013 12:57 pm

what do u say about viruses????

they show living and nonliving characters and one group of viruses (mimiviruses) show even their own metabolism outside a host.

shouldn't there be a 7th kingdom called false life exclusively for viruses as they show more living characters than the nonliving ones???

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JackBean
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Post by JackBean » Fri Sep 27, 2013 10:07 am

Where did you get the stuff about metabolism outside a host?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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Sumanth001
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Post by Sumanth001 » Fri Sep 27, 2013 11:41 am

Net of course!
Wikipedia knows it all.
But, not so convincing.
Type mimivirus in the search bar

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Sumanth001
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Post by Sumanth001 » Fri Sep 27, 2013 11:48 am

It can synthesise lipids, proteins, carbohydrates.
These are living reactions aren't they????

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Re: Living or not? (viruses,viroids and prions).

Post by wildfunguy » Sun Sep 29, 2013 1:09 pm

Are viruses more related to eachother or to their hosts?

Can they evolve?

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Re:

Post by wildfunguy » Sun Sep 29, 2013 4:16 pm

Raaar! I did not mean to post that primitive version of the post! How did that get posted!? :evil:

Sumanth001 wrote:shouldn't there be a 7th kingdom called false life exclusively for viruses as they show more living characters than the nonliving ones???

http://www.nature.com/scitable/topicpag ... s-14402410
The last two sections discuss its nucleic acid analysis and attempts at classification. In summary, if they descended from a once independent organism, that could mean the introduction of a new taxa that is superordinate to the domain.
However, the unused translation equipment may have been obtained through horizontal gene transfer, in which case they are not vestigial structures.

Sumanth001: ... and one group of viruses (mimiviruses) show even their own metabolism outside a host.
JackBean: Where did you get the stuff about metabolism outside a host?
Sumanth001: Net of course!
Wikipedia knows it all.
But, not so convincing.
Type mimivirus in the search bar


Wikipedia just says they have some equipment used in metabolism. In the last section of the Wikipedia article, about implications for definition of life, it says:
They do however, lack genes for ribosomal proteins, making mimivirus dependent on a host cell for protein translation and energy metabolism.

http://en.wikipedia.org/wiki/Mimivirus

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Sumanth001
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Post by Sumanth001 » Mon Sep 30, 2013 12:54 pm

sure enough but since it can make its proteins itself, my question is why does it need ribosomal proteins??? do ribosomal proteins define life???? if so, then viruses with protein coat would become living and prions too.And all other protein particles too would be living isn't it???

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Post by JackBean » Mon Sep 30, 2013 1:53 pm

Can you quote the Wikipedia or other source where it states that the mimivirus makes proteins independently of its host?
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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