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DNA Forum Discuss DNA, the molecule of hereditary. Topics include DNA structure, DNA replication, DNA function.


Do All Living Organisms Have DNA?

Do All Living Organisms Have DNA? - DNA Forum

Do All Living Organisms Have DNA? - Discuss DNA, the molecule of hereditary. Topics include DNA structure, DNA replication, DNA function.


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  #1  
Old 07-04-2008, 09:16 AM
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Default Do All Living Organisms Have DNA?



Hi everyone dumb question but do All Living Organisms Have DNA?
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  #2  
Old 07-11-2008, 11:51 AM
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Default Re: Do All Living Organisms Have DNA?

well, all living organism have nucleic acid but it could be RNA instead of DNA as in case of some viruses, RNA is the gentic material rather DNA.


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aftab
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Old 07-11-2008, 04:03 PM
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Default Re: Do All Living Organisms Have DNA?

Proteins are also in competition..if you accept prions as living..
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Old 07-17-2008, 05:53 AM
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Default Re: Do All Living Organisms Have DNA?

well
the simplest defination of living organism that is given by biologist is the body is living if it contain nucleic acid, can grow and produce its progeny.

prions are proteins that can make their copies but they dont contain nucleic acid, so they are not living. even there is contradiction on viruses, whether they are living or not.

some says they are living and other give evidences that they are not living.......

may be in future we have to change the definition of living organism.....


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aftab
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Old 10-31-2008, 12:24 PM
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Default Re: Do All Living Organisms Have DNA?

i agree with mr.Aftab
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Old 11-28-2008, 12:49 PM
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Default Re: Do All Living Organisms Have DNA?

Quote:
Originally Posted by Kellee View Post
Hi everyone dumb question but do All Living Organisms Have DNA?
all living organisms have their genome either in the form of DNA or RNA.Not DNA is the genome of all organisms.
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Old 11-28-2008, 02:22 PM
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Wink Re: Do All Living Organisms Have DNA?

Quote:
Originally Posted by aftabac View Post
well
the simplest defination of living organism that is given by biologist is the body is living if it contain nucleic acid, can grow and produce its progeny.

prions are proteins that can make their copies but they dont contain nucleic acid, so they are not living. even there is contradiction on viruses, whether they are living or not.

some says they are living and other give evidences that they are not living.......

may be in future we have to change the definition of living organism.....


regards
aftab
I think prions are protein that can change conformation of protein close to them, life is something more.
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Old 07-22-2010, 03:41 PM
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Default Re: Do All Living Organisms Have DNA?

Are you sure about that Aftab? I thought all organisms need DNA to generate RNA and use RNA to send messages to cells instructing on what proteins are to be prescribed.
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Old 07-22-2010, 04:55 PM
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Default Re: Do All Living Organisms Have DNA?

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Originally Posted by WannaBdr View Post
Are you sure about that Aftab? I thought all organisms need DNA to generate RNA and use RNA to send messages to cells instructing on what proteins are to be prescribed.
Some viruses have their genetic material in the form of RNA. If you consider viruses to be "alive" (which is the general consensus among biologists), then some living organisms do not contain DNA.

RNA-containing viruses hijack the transcriptional machinery of the cell they infect, in order to reverse-transcribe their RNA into DNA which can then be replicated. But the virus itself contains only RNA, no DNA.
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Old 07-22-2010, 08:04 PM
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Post Re: Do All Living Organisms Have DNA?

Well, citing my virology profesor I say that viruses are more like "biological entities", since there's not a definition of living being that applies to them up to now, not completely at least, that's the reason of the controversy.

There's a theory of the existence of a primitive RNA world, in which the nucleic acid of organisms (bacteria) was RNA.

According to this theory, viruses evolved and created DNA as a way to avoid bacterial endonucleases (then RNA specific), in other words, to fit for survival. These viruses introduced DNA in the RNA bearing bacteria and eventually DNA took over RNA as a more effective way to store and manage information.

I don't have the reference with me right now (my computer is on repair), but I'll post it as soon as I recover it.

By the way Bonnie, what you say applies for a few virus families (i.e. retrovirus). Most RNA viruses have RNA dependent RNA polymerases, which means they can have their RNA replicate directly from a RNA template, completely without DNA.
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