unrealistic in what sense? I know that we don't know much about early earth. My point is that you say that it's unlikely that amino acids spontaneously form. Yet this experiment shows exactly a case where they do. Are you saying that the M-U experiment illustrates the ONLY conditions under which amino acids are formed? It certainly isn't. There are many clouds of interstellar gas containing amino acids.
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The probability of the formation of only one protein molecule is "1 in 10300".
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What does this mean? I know of many self assembled polymers. The DNA/RNA bases, for example, will self assemble into pairs when they are put together due to matching polar groups between the complimentary bases. These bases are demonstrated to exist outside of earth in interstellar clouds as well as on earth. When placed in solution, they bond spontaneously.
Are you speaking about the probability of a peptide bond occurring? In what environment are you basing this probability? The probability is clearly MUCH higher than what you state inside a ribosome where proteins are made in our bodies... And ribosomes are self assembled chains of nucleotides that form a superstructure that increases the chance that peptide bonds will form between amino acids....
So under what conditions are you stating your probability? What is your reference for the probability of the peptide bond occurring and under what chemical environment are you making your claim about a probability of occurrence?