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

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