单项选择题
最可能形成z-DNA的序列是( )。
A．5’-ATATATATATATATATATAT-3’ 3"一TATATATATATATATATATA-5’
B．5’-AAAAAAAAAAAAAAAAAAAA-3’ 3"-TTTTTTTTTTTTTTTTTTTT-5’
C．5’-GCGCG(2GCGCGCCGCGCGCG一3’ 3"-CGCGCGCGCGCGCGCGCGCG-5’
D．5’-GGGGGGGGGGGGGGGGGGGG一3’ 3"-CCCCCCCCCCCCCCCCCCCCC一5’