50.下列何種方法是利用引子結合位來區分單一點突變,使擴增出來的片段長度不同而辨別正常型或是突變型? (A)增幅限制酶切位點(Amplified created restriction site, ACRS) (B)增幅阻礙突變系統(Amplified refractory mutation system, ARMS) (C)應用核酸序列的放大反應(Nucleic acid sequence-based amplification, NASBA) (D)單股結構多型性(Single-strand conformation polymorphism, SSCP)