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From: Ernest Major <{$to$}@meden.demon.co.uk>
Newsgroups: talk.origins
Subject: Re: Life: Turn it upside down!
Date: Tue, 9 Apr 2024 22:41:27 +0100
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On 09/04/2024 19:17, Arkalen wrote:
> 
> Sorry, I thought you'd excluded viruses with the "step down from there" 
> bit. The gulf is still huge between viruses and cellular life but I 
> guess it's true the gulf between cellular life and nonlife is smaller if 
> you include them. The issue in terms of abiogenesis is that it's unclear 
> whether they're true intermediates or if they arose after or parallel to 
> cellular life.

It's conceivable that all three models for the origins of viruses 
(relicts of pre-cellular life, highly reduced descendants of parasitic 
cells, rogue genes) are true, for different groups of viruses.

Mimivirus has a bigger genome and more genes than some cellular 
organisms, including some genes involved in metabolism and in protein 
synthesis. This, and nucleocytoplasmic large DNA viruses in general, 
seem to go some of the way in filling the gap between viruses in general 
and cellular organisms.

-- 
alias Ernest Major