皮皮学，免费搜题
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【单选题】
具有羟基或氨基的药物或代谢物在体内代谢时,在磺基转移酶的催化下,主要与()
A.
葡萄糖醛酸结合
B.
硫酸基结合
C.
谷胱甘肽结合
D.
氨基酸结合
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举一反三
【单选题】触点在闭合过程中常常会发生弹跳现象，减小弹跳的方法是：
A.
消除动静触点的相互碰撞和电动力的推斥
B.
采用柔性碰撞结构
C.
提高返回弹簧的推斥作用
D.
减小静触点对动触点的反作用力
查看完整题目与答案
【判断题】反应物浓度增大，反应速率必定增大。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在关系代数的连接操作中,哪一种连接操作需要取消重复列?
A.
自然连接
B.
笛卡儿积
C.
等值连接
D.
θ连接
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【简答题】预制桩的打桩顺序有___、___、分段打设等几种.
查看完整题目与答案
【简答题】王某于1994年8月经招工考试被某企业录用，并签订为期三年的劳动合同。95年8月，企业以王某连续旷工28天，严重违反劳动纪律为由，对其作出除名并解除劳动合同的处理，同时开具退工单。王某不服，向当地劳动争议仲裁委员会提出申诉，要求维持劳动关系。仲裁委员会经调查确认，王某入厂以来，确有迟到、早退现象，最近半年以来，还常常完不成定额，95年5月又擅自出走28天。同时在调查中也听许多职工反映王某精神不正常...
查看完整题目与答案
【单选题】在关系代数的连接操作中,哪一种连接操作需要取消重复列? ( )
A.
自然连接
B.
笛卡 尔 积
C.
等值连接
D.
θ连接
查看完整题目与答案
【单选题】Which of the following tissue synthesize purine nucleotides mainly by salvage pathway
A.
bone marrow
B.
liver
C.
kidney
D.
myocardium
E.
skeletal muscle
查看完整题目与答案
【判断题】反应物浓度增大,反应速率必定增大
A.
正确
B.
错误
查看完整题目与答案
【判断题】“仅限货机”标贴紧挨着操作标贴粘贴。
A.
正确
B.
错误
查看完整题目与答案
【多选题】What are the pathway of transcription initiation and the fate of the σ subunit in bacteria?
A.
The pathway consists of two major parts, binding and initiation, each with multiple steps. First, the polymerase, directed by its bound σ factor, binds to the promoter. A closed complex (in which the bound DNA is intact) and an open complex (in which the bound DNA is intact but partially unwound near the −10 sequence) form in succession.
B.
Second, transcription is initiated within the complex, leading to a conformational change that converts the complex to the elongation form, followed by movement of the transcription complex away from the promoter (promoter clearance).
C.
Any of these steps can be affected by the specific makeup of the promoter sequences. The σ subunit dissociates stochastically (at random) as the polymerase enters the elongation phase of transcription. The protein NusA (Mr 54,430) binds to the elongating RNA polymerase, competitively with the σ subunit.
D.
Once transcription is complete, NusA dissociates from the enzyme, the RNA polymerase dissociates from the DNA, and a σ factor (σ 70 or another) can again bind to the enzyme to initiate transcription.
查看完整题目与答案
相关题目：
【单选题】触点在闭合过程中常常会发生弹跳现象，减小弹跳的方法是：
A.
消除动静触点的相互碰撞和电动力的推斥
B.
采用柔性碰撞结构
C.
提高返回弹簧的推斥作用
D.
减小静触点对动触点的反作用力
查看完整题目与答案
【判断题】反应物浓度增大，反应速率必定增大。
A.
正确
B.
错误
查看完整题目与答案
【单选题】在关系代数的连接操作中,哪一种连接操作需要取消重复列?
A.
自然连接
B.
笛卡儿积
C.
等值连接
D.
θ连接
查看完整题目与答案
【简答题】预制桩的打桩顺序有___、___、分段打设等几种.
查看完整题目与答案
【简答题】王某于1994年8月经招工考试被某企业录用，并签订为期三年的劳动合同。95年8月，企业以王某连续旷工28天，严重违反劳动纪律为由，对其作出除名并解除劳动合同的处理，同时开具退工单。王某不服，向当地劳动争议仲裁委员会提出申诉，要求维持劳动关系。仲裁委员会经调查确认，王某入厂以来，确有迟到、早退现象，最近半年以来，还常常完不成定额，95年5月又擅自出走28天。同时在调查中也听许多职工反映王某精神不正常...
查看完整题目与答案
【单选题】在关系代数的连接操作中,哪一种连接操作需要取消重复列? ( )
A.
自然连接
B.
笛卡 尔 积
C.
等值连接
D.
θ连接
查看完整题目与答案
【单选题】Which of the following tissue synthesize purine nucleotides mainly by salvage pathway
A.
bone marrow
B.
liver
C.
kidney
D.
myocardium
E.
skeletal muscle
查看完整题目与答案
【判断题】反应物浓度增大,反应速率必定增大
A.
正确
B.
错误
查看完整题目与答案
【判断题】“仅限货机”标贴紧挨着操作标贴粘贴。
A.
正确
B.
错误
查看完整题目与答案
【多选题】What are the pathway of transcription initiation and the fate of the σ subunit in bacteria?
A.
The pathway consists of two major parts, binding and initiation, each with multiple steps. First, the polymerase, directed by its bound σ factor, binds to the promoter. A closed complex (in which the bound DNA is intact) and an open complex (in which the bound DNA is intact but partially unwound near the −10 sequence) form in succession.
B.
Second, transcription is initiated within the complex, leading to a conformational change that converts the complex to the elongation form, followed by movement of the transcription complex away from the promoter (promoter clearance).
C.
Any of these steps can be affected by the specific makeup of the promoter sequences. The σ subunit dissociates stochastically (at random) as the polymerase enters the elongation phase of transcription. The protein NusA (Mr 54,430) binds to the elongating RNA polymerase, competitively with the σ subunit.
D.
Once transcription is complete, NusA dissociates from the enzyme, the RNA polymerase dissociates from the DNA, and a σ factor (σ 70 or another) can again bind to the enzyme to initiate transcription.
查看完整题目与答案