Ringtone
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- Sep 3, 2019
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I'm still fascinated by the Evolutionary explanation of how the first cells appeared: well, they just did! We know they existed, therefore evolution!
Darwin didn't shed any light on the creation of organic cells and still today, there two very different, and equally plausible explanations for the source of organic cells on Earth. But the science is never settled, as no science ever is.
We know by experimentation that carbon-based organic molecules will spontaneously combine from existing free elements under conditions found in nature.
Hydrocarbon chains are ubiquitous in nature, but cellular membranes are comprised of complex and precisely arranged molecular compounds, namely, phospholipids and proteins. In the first place, the molecular precursors of phospholipids and proteins, in and of themselves, do not spontaneously combine in raw nature, i.e., outside living cells.
We also know that organic molecules that exist in space and which exist in our solar system have been found on meteorites found on Earth.
Either explanation could explain the existence of organic molecules -- or --- both could be true.
The existence of the underlying chemical substance of organic molecules isn’t really what needs to be explained. We know that life is comprised of the stuff of the universe, and we know for a fact that a few amines and amino acids are naturally produced in outer space and in serpentinizing rocks on seafloors.
Under variously simulated environmental and atmospheric conditions in the laboratory, we have synthesized 31 amino acids, 17 of which are among the 20 of life, 6 amines, 12 peptides, the purines and pyrimidines of life, and the ribonucleotides cytosine and uracil. But here’s the caveat. Other than the few amines and amino acids produced in raw nature, we can’t produce the others outside the carefully controlled conditions of the laboratory.