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举一反三
【单选题】构成蛋白质一级结构的化学键是
A.
氨基酸的α-羧基与相邻氨基酸α-氨基脱水缩合成肽键
B.
肽键与肽键之间形成氢键
C.
侧链间的氢键
D.
次级键
E.
游离氨基与羧基形成肽键
【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】DNA的一级结构实质上就是( )。
A.
DNA分子中的碱基排列顺序
B.
DNA分子中的碱基配对关系
C.
DNA分子中的各碱基所占的比例
D.
DNA分子的双螺旋结构
E.
DNA分子中的碱基种类
【单选题】蛋白质分子的一级结构概念主要是指：（）
A.
组成蛋白质多肽链的氨基酸数目
B.
氨基酸种类及相互比值
C.
氨基酸的排列顺序
D.
二硫键的数目和位置
E.
肽键的数目和位置