Samples collected from a comet’s halo suggest comets could have carried amino acids - building block of proteins - to the early Earth...
B. Proteins NOT early life's building blocks
Proteins have nothing to do with the initiation and evolution of early Earth's life, the biosphere. RNA's, followed with DNA's, were "life's building blocks", the constituents of the early independent genes, Earth's primal organisms.
Earliest and present primary Earth life are, obviously and commonsensibly, and therefore scientifically, genes. Plain and simple. All other organisms, regardless of complexity, are take-offs of genes. Early life was formed and maintained with DIRECT sunlight. Hence ubiquitous life sleep. Biometabolism, dependence of life on INDIRECT sunlight energy, was a very late phase of Earth's life evolution.
Of the 64 basic amino acids possible, are the amino acids found in these extraterristal rocks the same basic 14(?) grouping combination found here on earth. If so then it would be possible that life elsewhere in the universe would be compatible with life on earth (we could eat the same foods) and we would also be susceptable to diseases from another world.
This is just an interesting thought to mull around in your heads.
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Dov Henis 8:15PM August 25, 2009
Robert L. Matarainen of NY 7:30PM August 20, 2009