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【简答题】
SNET是一家提供软交换设备的供应商。他与国内运营商ACA达成协议,准备在中国东部的一个城市试验应用新型软交换设备。ACA是国内第一家准备采用软交换设备的运营商,因此在与SNET的协议中,ACA提出,设备的有些功能处于开发之中,他们的需求还没有完全明确,并且将随着应用的增加不断提出。SNET答应了运营商的条件,因为他们认为只有通过这种方式,最终赢得后续的合同。 从 2001年3月项目开始进行,ACA不直接运作项目,而是通过当地的一家运营商,共同提供网络资源。根据协议规定,由SNET提供设备,验收合格后,ACA再付款给SNET。 项目即将完成时,SNET向ACA提出建议,希望ACA采购最新版本的设备。运营商也倾向于采用最新的设备,但同时要求进行全面的测试。因此,付款的事情暂时搁置。正当系统进行测试时,几家竞争对手也向ACA提出了新设备的测试建议,ACA决定再增加另外两家新的供应商进行测试。随着测试的进行,ACA发现几种设备各有特色,功能不尽相同,而且无法兼容在一起。经过电信专家组的论证,认为采用现有技术还不成熟,会增加系统的风险,建议ACA暂缓采用这种新的技术。 9月底,就在SNET和新加入的竞争伙伴正在做测试的时候,ACA总部发了一个文件,要求暂停试验,项目中止。SNET没有拿到任何付款。在这个项目中,SNET损失惨重,白白投入了大量资金和时间却没拿到任何付款。 你认为该如何避免这种情况呢?
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举一反三
【判断题】Proteins can only bind to other proteins.
A.
正确
B.
错误
查看完整题目与答案
【多选题】A cell can control the proteins it contains by:
A.
(1) controlling when and how often a given gene is transcribed, (2) controlling how an RNA transcript is spliced or otherwise processed
B.
(3) selecting which mRNAs are exported from the nucleus to the cytosol
C.
(4) regulating how quickly certain mRNA molecules are degraded, (5) selecting which mRNAs are translated into protein by ribosomes
D.
(6) regulating how rapidly specific proteins are destroyed after they have been made; in addition, the activity of individual proteins, once they have been synthesized, can be further regulated in a variety of ways
查看完整题目与答案
【多选题】The lateral mobility of plasma membrane proteins can be restricted in several ways. Proteins can be tethered:
A.
to the cell cortex inside the cell
B.
to extracellular matrix molecules outside the cell
C.
to proteins on the surface of another cell
D.
d iffusion barriers
查看完整题目与答案
【多选题】Proteins can be globular or fibrous, and they can form ____________________.
A.
filaments
B.
sheets
C.
rings
D.
spheres
查看完整题目与答案
【多选题】The membrane proteins can be classified into three categories: ( )
A.
integral proteins
B.
lipid-anchored membrane proteins
C.
peripheral membrane proteins
D.
glycoprotein
查看完整题目与答案
【判断题】与边沁相比，密尔提出快乐不仅有数量的区分，也有质的不同，但是他无法有说服力地证明精神快乐高于物质快乐的理由，所以这种区分是无意义的。()
A.
正确
B.
错误
查看完整题目与答案
【多选题】Membrane proteins can associate with the lipid bilayer in different ways:
A.
Transmembrane proteins can extend across the bilayer as a single α helix, as multiple α helices, or as a rolled-up β sheet (called a β barrel). These transmembrane proteins are amphipathic, having both hydrophobic and hydrophilic regions. Their hydrophobic regions lie in the interior of the bilayer, nestled against the hydrophobic tails of the lipid molecules. Their hydrophilic regions are exposed to the aqueous environment on either side of the membrane.
B.
Some membrane proteins are anchored to the cytosolic half of the lipid bilayer by an amphipathic α helix.
C.
Some proteins lie entirely outside the bilayer, on one side or the other, attached to the membrane by one or more covalently attached lipid groups.
D.
Many proteins are attached to the membrane only by relatively weak, noncovalent interactions with other membrane proteins.
查看完整题目与答案
【简答题】Proteins can be selectively precipitated by ____________ and _____________.
查看完整题目与答案
【单选题】三山实验，是心理学家皮亚杰做过的一个著名的实验皮亚杰以此来证明儿童的“（ ）”的特点。
A.
客体永久性
B.
自我中心
C.
泛灵论
D.
不可逆性
查看完整题目与答案
【判断题】Only carrier proteins can carry out active transport, but both carrier proteins and channel proteins can carry out passive transport.
A.
正确
B.
错误
查看完整题目与答案
相关题目：
【判断题】Proteins can only bind to other proteins.
A.
正确
B.
错误
查看完整题目与答案
【多选题】A cell can control the proteins it contains by:
A.
(1) controlling when and how often a given gene is transcribed, (2) controlling how an RNA transcript is spliced or otherwise processed
B.
(3) selecting which mRNAs are exported from the nucleus to the cytosol
C.
(4) regulating how quickly certain mRNA molecules are degraded, (5) selecting which mRNAs are translated into protein by ribosomes
D.
(6) regulating how rapidly specific proteins are destroyed after they have been made; in addition, the activity of individual proteins, once they have been synthesized, can be further regulated in a variety of ways
查看完整题目与答案
【多选题】The lateral mobility of plasma membrane proteins can be restricted in several ways. Proteins can be tethered:
A.
to the cell cortex inside the cell
B.
to extracellular matrix molecules outside the cell
C.
to proteins on the surface of another cell
D.
d iffusion barriers
查看完整题目与答案
【多选题】Proteins can be globular or fibrous, and they can form ____________________.
A.
filaments
B.
sheets
C.
rings
D.
spheres
查看完整题目与答案
【多选题】The membrane proteins can be classified into three categories: ( )
A.
integral proteins
B.
lipid-anchored membrane proteins
C.
peripheral membrane proteins
D.
glycoprotein
查看完整题目与答案
【判断题】与边沁相比，密尔提出快乐不仅有数量的区分，也有质的不同，但是他无法有说服力地证明精神快乐高于物质快乐的理由，所以这种区分是无意义的。()
A.
正确
B.
错误
查看完整题目与答案
【多选题】Membrane proteins can associate with the lipid bilayer in different ways:
A.
Transmembrane proteins can extend across the bilayer as a single α helix, as multiple α helices, or as a rolled-up β sheet (called a β barrel). These transmembrane proteins are amphipathic, having both hydrophobic and hydrophilic regions. Their hydrophobic regions lie in the interior of the bilayer, nestled against the hydrophobic tails of the lipid molecules. Their hydrophilic regions are exposed to the aqueous environment on either side of the membrane.
B.
Some membrane proteins are anchored to the cytosolic half of the lipid bilayer by an amphipathic α helix.
C.
Some proteins lie entirely outside the bilayer, on one side or the other, attached to the membrane by one or more covalently attached lipid groups.
D.
Many proteins are attached to the membrane only by relatively weak, noncovalent interactions with other membrane proteins.
查看完整题目与答案
【简答题】Proteins can be selectively precipitated by ____________ and _____________.
查看完整题目与答案
【单选题】三山实验，是心理学家皮亚杰做过的一个著名的实验皮亚杰以此来证明儿童的“（ ）”的特点。
A.
客体永久性
B.
自我中心
C.
泛灵论
D.
不可逆性
查看完整题目与答案
【判断题】Only carrier proteins can carry out active transport, but both carrier proteins and channel proteins can carry out passive transport.
A.
正确
B.
错误
查看完整题目与答案