The genetic code of early microorganisms was 'naturally selected' by amino acids, according to a primordial Earth simulation.
The exact mechanism by which life emerged from inanimate matter remains a huge enigma. Now, a recent study published in thescientists have discovered that natural selection might have had an impact before life as we know it even existed on Earth.
Even though the primordial Earth had hundreds of amino acids, all living things use the same 20 of these compounds. Science has struggled to pinpoint what's so special—if anything—about those 20 'canonical' amino acids. By combining a set of amino acids that were particularly abundant before life first appeared on Earth, the researchers could recreate the synthesis of proteins 4 billion years ago in the lab.
Significantly, the amino acids most adapted for 'folding proteins' into shapes essential to vital functions tend to be integrated into the biochemistry of ancient organic compounds. In this way, such compounds had a better chance of survival. Over time, more chemical molecules with these favorable characteristics for life emerged.
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