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Viroids

viroids

A group of pathogens comprising the smallest known agents of infectious disease. They are unencapsulated and are capable of replicating autonomously in susceptible cells. Positively identified viroids composed of single-stranded rNA have been isolated from higher plants, but the existence of dNA viroids pathogenic to animals is suspected.


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

For those who don't know, some viruses have membrane-like structures called "envelopes". http://en.wikipedia.org/wiki/Viral_envelope I don't know what distinguishes a membrane from an envelope.

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by wildfunguy
Thu Oct 17, 2013 10:57 pm
 
Forum: Microbiology
Topic: Living or not? (viruses,viroids and prions).
Replies: 15
Views: 4549

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

Are viruses more related to eachother or to their hosts? Can they evolve?

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by wildfunguy
Sun Sep 29, 2013 1:09 pm
 
Forum: Microbiology
Topic: Living or not? (viruses,viroids and prions).
Replies: 15
Views: 4549

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

... 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 ...

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by Sumanth001
Sun Jun 30, 2013 3:30 am
 
Forum: Microbiology
Topic: Living or not? (viruses,viroids and prions).
Replies: 15
Views: 4549

Bible vs Darwin

... explain the origins of the first primitive "proto-cells." RNA is also capable of surviving fairly well on its own, as the existence of viroids (basically similar to retroviruses but without the protein coating) testifies. An entire hypothesis called the "RNA world" has been ...

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by alextemplet
Tue Oct 14, 2008 12:01 am
 
Forum: Evolution
Topic: Bible vs Darwin
Replies: 293
Views: 280697

Re: Are any of these "alive": prions, viroids, virions?

Ok, those plasmids, nuclei and transposons were mostly just a joke (although they have part in demonstarting how difficult it is to define 'life'), but mitochondria are an interesting case along viruses - they're not parasites, but they could be thought of as very specialised symbiots - much more so...

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by biohazard
Fri Apr 04, 2008 12:34 pm
 
Forum: Microbiology
Topic: Are any of these "alive": prions, viroids, virions?
Replies: 10
Views: 10639
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