Life' Proteins - Unknown

This quote was added by tgrassmann40378
There is, however, another problem that confronts evolutionary theory. There are over 100 amino acids, but only 20 are needed for life's proteins. Moreover, they come in two shapes: Some of the molecules are "right-handed" and others are "left-handed". And there is no known reason why either shape should be preferred in living things. Yet, of the 20 amino acids used in producing life's proteins, all are left-handed!

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