Assertion: dna's base | /r/HasProperty | four types
Facets:
Source sentences:
text: The nitrogenous bases in DNA are of four types –
text: The nitrogenous bases could be of two types: purines and pyrimidines.
text: The bases are of four types (A, C, G, & T): pairing always occurs between A & T, and C & G. James Watson (1928 - ) and Francis Crick (1916 - 2004) realized that these pairing rules meant that either strand contained all the information necessary to make a new copy of the entire molecule, and that the aperiodic order of bases might provide a "genetic code".