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【单选题】
在我们本学期做的质粒提取实验中,关于 K2 溶液功能叙述不正确的是 ?
A.
破碎细菌细胞
B.
致使质粒 DNA 变性
C.
导致蛋白质变性
D.
降解 RNA
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】有如下事件过程：Private Sub Form_Load() Show Dim Arr() As Variant Arr = Array(1, 3, 5, 7, 9, 11, 13, 15) Call converse(Arr) For i = 0 To 7 Print arr(i); Next iEnd Sub 以上程序的功能是，通过调用Converse过程，将数组Arr中的元素逆序存放并输出...
A.
Private Sub converse(dim a() as Variant ) Dim T For i = LBound(A) To UBound(A) T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
B.
Private Sub converse(dim a() as Variant) Dim T Dim J As Integer J = (LBound(A) + UBound(A)) / 2 For i = LBound(A) To J T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
C.
Private Sub converse(a() As Variant) Dim T For i = LBound(A) To UBound(A) T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
D.
Private Sub converse(a() As Variant) Dim T Dim J As Integer J = Int((LBound(A) + UBound(A)) / 2) For i = LBound(A) To J T = a(i) a(i) = a(UBound(A) - i) a(UBound(A) - i) = T Next i End Sub
【单选题】与100mL0.5mol/LNaCl溶液所含的Cl-物质的量浓度相同的是（ ）
A.
100mL0.5mol/LMgCl2溶液
B.
200mL0.25mol/LAlCl3溶液
C.
50mL 0.5mol/LKCl溶液
D.
25mL0.5mol/LFeCl3溶液
【单选题】下列溶液中的Cl - 浓度与50mL1mol/L的AlCl 3 溶液中的Cl - 浓度相等的是（ ）
A.
150ml1mol/L的NaCl溶液
B.
50ml3mol/L的NaCl溶液
C.
150ml3mol/L的MgCl 2 溶液
D.
75ml2mol/L的KCl溶液
【单选题】下列关于0.1 mol·L-1硝酸钾溶液的叙述中，正确的是( )
A.
1 L该溶液中含有硝酸钾101 g
B.
100 mL该溶液中含有硝酸钾0.01 mol
C.
从1 L该溶液中取出500 mL后，剩余溶液的浓度为0.05 mol·L-1
D.
1 L水中溶解0.1 mol硝酸钾,即可配得0.1 mol·L-1硝酸钾溶液
【单选题】已知 HAc的pKa=4.75,将0.Olmol/L HAc溶液与0.1mol/L NaAc溶液等体积 混合,则此缓冲溶液的 pH为( )
A.
3.75
B.
4.75
C.
5.75
D.
9.25