Scientists have uncovered a surprising role for calcium in shaping the building blocks of life. Their study reveals that calcium ions help determine the molecular 'handedness' (chirality) of tartaric acid polymers -- an essential feature of biological molecules like DNA and proteins. This discovery sheds light on how life's uniform molecular structures may have first emerged on early Earth. In a twist on traditional theories, the researchers suggest that simple polyesters, in addition to peptides or nucleic acids, could have adopted this crucial trait on early Earth, offering a fresh perspective on life's chemical origins.
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