Origin of Life
نویسنده
چکیده
-helix A polypeptide structure in which amino acids spiral around a central axis. There are 3.6 amino acids per turn. -strand A polypeptide structure in which the backbone zigzags and the side groups of the individual amino acids stick out on opposite sides. exon The portion of an RNA molecule that is retained in final product and usually codes for a protein. intron The portion of an RNA molecule that is cut out so that exons can be ligated together.
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