Scientists have carefully simulated conditions on Earth in the earliest part of its history, some 4.6 billion years ago, hoping to unlock a greater understanding of how amino acids brought the first ingredients for life into being.
, hoping to unlock a greater understanding of how amino acids brought the first ingredients for life into being.
It's thought that these 20 amino acids are made up of 10 'early' ones picked from the atmosphere and meteorite fragments of early Earth, and 10 'later' ones added on top – but what the selection process for the latter 10 involved isn't clear.
In other words, a process of evolution or natural selection was underway even at this stage: it wasn't the amino acids that were most readily available that were picked, but the amino acids most suited to a particular job. "Protein folding was basically allowing us to do evolution before there was even life on our planet,"
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