Assertion: dna | /r/HasProperty | structured as double helix
Facets:
value: with the chemical bases
type: OTHER
Source sentences:
text: In 1953, scientists proposed that DNA is structured as a double helix, with the chemical bases—adenine (A), cytosine (C), guanine (G), and thymine (T)—stacked up in pairs between two intertwining lengths of sugar and phosphate.