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【多选题】
Lac操纵子的表达需有A.
葡萄糖缺乏
B.
乳糖存在
C.
cAMP浓度较高
D.
阻遏蛋白浓度较低
E.
CAP浓度较高
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皮皮学刷刷变学霸
举一反三
【单选题】According to the writer, compulsive bargain hunters are in constant search of the lowest possible prices ______.
A.
because they want to save money to help their budgets
B.
because they can openly boast of their triumph over others in getting things for less
C.
and will not have money problems if they can keep to their budgets
D.
but they seldom admit they feel satisfied if they can get things for less than others
【单选题】According to the author, compulsive bargain hunters are in constant search of the lowest possible price______.
A.
because they want to save money to help their budgets
B.
because they can openly boast of their triumph over others in getting things for less money
C.
and will not have money problems if they can keep to their bud gets
D.
but they seldom admit they feel satisfied if they can get things for less money than others
【单选题】According to the author, compulsive bargain hunters arc in constant search of the lowest possible prices ______.
A.
because they want to save money to help their budgets
B.
because they can openly boast of their triumph over others in getting things for less
C.
and will not have money problems if they can keep to their budgets
D.
but they seldom admit they feel satisfied if they can get things for less than others
【单选题】All of the following rules are true about the lowest level WBS work packages except work packages:
A.
can be completed without interruption in one location。
B.
can be confidently estimated。
C.
must be assigned to only 1 person。
D.
must be completed within 80 hours。
【单选题】嘌呤核苷酸从头合成的特点是
A.
先合成嘌呤碱，再与磷酸核糖结合
B.
先合成嘌呤碱，再与氨基甲酰磷酸结合
C.
在磷酸核糖焦磷酸的基础上逐步合成嘌呤核苷酸
D.
在氨基甲酰磷酸基础逐步合成嘌呤核苷酸
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