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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: OT: Life from a drop of rain, New research suggests rainwater helped form the first protocell walls
Date: Fri, 23 Aug 2024 11:03:10 -0700
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On Fri, 23 Aug 2024 10:59:17 +0100, Martin Brown
<'''newspam'''@nonad.co.uk> wrote:

>On 22/08/2024 23:40, john larkin wrote:
>> On Thu, 22 Aug 2024 04:33:34 GMT, Jan Panteltje <alien@comet.invalid>
>> wrote:
>> 
>>> Life from a drop of rain: New research suggests rainwater helped form the first protocell walls
>>> A Nobel-winning biologist, two engineering schools, and a vial of Houston rainwater
>>> cast new light on the origin of life on Earth
>>> https://www.sciencedaily.com/releases/2024/08/240821150020.htm
>>> Date:
>>> August 21, 2024
>>> Source:
>>> University of Chicago
>>> Summary:
>>> New research shows that rainwater could have helped create a meshy wall around protocells 3.8 billion years ago, a critical step in the transition from tiny beads of RNA to every bacterium, plant, animal, and human that ever lived.
>>>
>>> There you go, simplicity!
>> 
>> It's easy to form a blob with some goo inside. Like mayonaise.
>
>One conjecture is that it takes a planet with a decent sized moon so 
>that tide range is variable to have rock pools that concentrate the 
>chemistry to a point where it works. We will know better once Mars or 
>Europa has been properly explored. Finding life independently evolved 
>somewhere else would go a long way to answering these questions.
>> 
>> The hard part is the DNA and all its tousands of supporting
>> structures.
>
>That is why self replicating autocatalytic peptides and RNA probably 
>came first. They are much less stable and mutate faster. But RNA is good 
>enough that plenty of viruses and viroids (plant pathogens) still use it 
>today. They are the last remnants of earlier pre-DNA life on Earth.
>

Or they are parasites that evolved after DNA life.


>DNA with its double helix preserves information much more reliably in 
>complex organisms, but that came much later when cells started to have a 
>nucleus and organelles inside. Primitive life had neither just a single 
>chromosome (and bacteria today are descendents of those archaea).

Proponents of RNA World should design an RNA based reproducing,
evolving life form.