A.实验过程中用到的培养基和培养皿必须采用高压蒸汽灭菌法灭菌 |
B.与甲培养基成分相比,乙培养基成分中可能缺少了鸟氨酸 |
C.若乙培养基中未出现菌株,则说明紫外线照射未引起基因突变 |
D.从甲培养基中选出的B菌株,可直接利用含精氨酸的培养液进行发酵 |
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