def isDNA(self):
for nuc in self.sequenceData:<EOL><INDENT>if nuc not in DNA_NUCS:<EOL><INDENT>return False<EOL><DEDENT><DEDENT>return True<EOL>
Make a guess as to whether this sequence is a DNA sequence or not by
looking at the symbols it contains.

:return: True if contains only DNA nucleotides, False otherwise