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Which major concept of genetics was illustrated in the model designed by Watson and Crick?
Zephyris. DNA Structure. Digital image. Wikimedia Commons. N.p., 26 Apr. 2011. Web. <https://commons.wikimedia.org/wiki/File:DNA_Structure%2BKey%2BLabelled.pn_NoBB.png
DNA exhibits a double helix structure.
DNA was the molecule of heredity.
DNA copies itself through semiconservative replication.
Amino acids may have been the first biological molecules formed on Earth.