皮皮学，免费搜题
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【单选题】
对火灾警报装置的外观清洁维护时,下列做法正确的是 () 。
A.
自行拆卸加以清洗
B.
用水冲洗
C.
用湿布擦拭
D.
用吹风机吹扫火灾警报装置表面
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举一反三
【单选题】The pathway by which the parasites travel from one host to another is called the route of___.
A.
sterilization
B.
disinfection
C.
transmission
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【多选题】花岗岩装饰板材，按表面加工程度分为( )。
A.
细面板材
B.
镜面板材
C.
粗面板材
D.
凸面板材
查看完整题目与答案
【简答题】过程工业是以( )为处理对象,完成各种生产过 程的工业。通常由一系列的( )和 ( ) ,按一定的流程方式用管道、阀门等连接起来的一个独立的密闭连续系统,再配以必要的控制仪表和设备,来完成产品的生产过程。
查看完整题目与答案
【单选题】The statins are the major class of medications used to lower elevated serum cholesterol by initially inhibiting the major rate-limiting step of cholesterol synthesis. Which metabolite of the pathway w...
A.
Acetoacetyl-CoA
B.
HMG-CoA
C.
Mevalonate
D.
Squalene
E.
Steroid ring
查看完整题目与答案
【单选题】板尺(BM_Board_Feet_Board_Measurement_Feet)用于计量 (40794:第五章_杂货船运输:1241)
A.
危险品
B.
液体气体
C.
液体散装化学品
D.
木材
查看完整题目与答案
【简答题】A.Two thousand feet. B.Twelve thousand feet. C.Twenty thousand feet. D.Twenty-two thousand feet.
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【单选题】In order for a cell to carry out its biologic functions, the intracellular reactions need to be directed to follow a certain pathway. Which one statement best describes the direction a chemical reacti...
A.
A reaction with positive free energy will proceed in the forward direction if the substrate concentration is raised high enough.
B.
Under standard conditions, a reaction will proceed in the forward direction if the free energy Δ G0 ′ is positive.
C.
The direction of a reaction is independent of the initial substrate and product concentrations because the direction is determined by the change in free energy.
D.
The concentration of all of the substrates must be higher than that of all of the products for the reaction to proceed in the forward direction.
E.
The enzyme for the reaction must be working at >50% of its maximum efficiency for the reaction to proceed in the forward direction.
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【单选题】The pathway by which hormones are transmitted does NOT include ( )
A.
blood transportation
B.
Diffusion through tissue fluid
C.
axoplasmic transport in the nerve
D.
Secreted by gland duct
E.
autocrine
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【单选题】Janelle cut a board 30 feet long into 2 pieces. The ratio of the lengths of the 2 pieces is 2:3. What is the length,to the nearest foot, of the shorter piece?
A.
5
B.
6
C.
12
D.
15
E.
18
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】The pathway by which the parasites travel from one host to another is called the route of___.
A.
sterilization
B.
disinfection
C.
transmission
查看完整题目与答案
【多选题】花岗岩装饰板材，按表面加工程度分为( )。
A.
细面板材
B.
镜面板材
C.
粗面板材
D.
凸面板材
查看完整题目与答案
【简答题】过程工业是以( )为处理对象,完成各种生产过 程的工业。通常由一系列的( )和 ( ) ,按一定的流程方式用管道、阀门等连接起来的一个独立的密闭连续系统,再配以必要的控制仪表和设备,来完成产品的生产过程。
查看完整题目与答案
【单选题】The statins are the major class of medications used to lower elevated serum cholesterol by initially inhibiting the major rate-limiting step of cholesterol synthesis. Which metabolite of the pathway w...
A.
Acetoacetyl-CoA
B.
HMG-CoA
C.
Mevalonate
D.
Squalene
E.
Steroid ring
查看完整题目与答案
【单选题】板尺(BM_Board_Feet_Board_Measurement_Feet)用于计量 (40794:第五章_杂货船运输:1241)
A.
危险品
B.
液体气体
C.
液体散装化学品
D.
木材
查看完整题目与答案
【简答题】A.Two thousand feet. B.Twelve thousand feet. C.Twenty thousand feet. D.Twenty-two thousand feet.
查看完整题目与答案
【单选题】In order for a cell to carry out its biologic functions, the intracellular reactions need to be directed to follow a certain pathway. Which one statement best describes the direction a chemical reacti...
A.
A reaction with positive free energy will proceed in the forward direction if the substrate concentration is raised high enough.
B.
Under standard conditions, a reaction will proceed in the forward direction if the free energy Δ G0 ′ is positive.
C.
The direction of a reaction is independent of the initial substrate and product concentrations because the direction is determined by the change in free energy.
D.
The concentration of all of the substrates must be higher than that of all of the products for the reaction to proceed in the forward direction.
E.
The enzyme for the reaction must be working at >50% of its maximum efficiency for the reaction to proceed in the forward direction.
查看完整题目与答案
【单选题】The pathway by which hormones are transmitted does NOT include ( )
A.
blood transportation
B.
Diffusion through tissue fluid
C.
axoplasmic transport in the nerve
D.
Secreted by gland duct
E.
autocrine
查看完整题目与答案
【单选题】Janelle cut a board 30 feet long into 2 pieces. The ratio of the lengths of the 2 pieces is 2:3. What is the length,to the nearest foot, of the shorter piece?
A.
5
B.
6
C.
12
D.
15
E.
18
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