限制酶 | 识别序列和切割位点 |
BamH I | 5'-G↓GATCC-3' |
Sau3 A I | 5'-↓GATC-3' |
Acc65 I | 5'-G↓GTACC-3' |
Bgl Ⅱ | 5'-A↓GATCT-3' |
Kpn I | 5'-GGTAC↓C-3' |
EcoR I | 5'-G↓AATTC-3' |
A.若某基因的1个位点被EcoR I切割,能断开4个磷酸二酯键 |
B.分别用Sau3A Ⅰ和Bgl Ⅱ切割同一种随机序列DNA,前者得到的片段数往往多于后者 |
C.BamH I和Sau3A I切割产生的DNA片段,经DNA连接酶连接后不能重新被Sau3AI切割 |
D.Acc65 Ⅰ和Kpn Ⅰ切割产生的DNA片段,经DNA连接酶连接后可以重新被Acc65Ⅰ切割 |
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2