5. Which of the following sequences of DNA is most likely to form Z-DNA?
(A)




【各選項詳解】評論
Z-DNA can form in regions of alternating purine–pyrimidine sequence; (GC)n sequences form Z-DNA most easily. (GT)n sequences also form Z-DNA but they require a greater stabilization energy for formation than (GC)n. (AT)n generally does not form Z-DNA since (AT)n easily forms cruciforms.