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【多选题】
语音拣选的特点有哪些 ( )。A.
不受恶劣环境影响
B.
降低劳动强度
C.
精确定位商品
D.
技术含量高 ， 需要高素质的人才
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反馈参考答案：
举一反三
【单选题】The movement of water molecules across the membrane in response to a concentration gradient is referred to as:
A.
diffusion
B.
osmosis
C.
translocation
D.
transport
【简答题】按照色泽不同,葡萄酒可分为红葡萄酒、白葡萄酒和 ,红葡萄酒是用 葡萄为原料,采用皮、汁混合发酵而成的葡萄酒 。
【单选题】Which of these is not a function of heat shock proteins (HSP)?
A.
aiding protein folding in intracellular compartments
B.
preventing protein aggregation
C.
facilitating the translocation of proteins across membranes
D.
facilitating the degradation of unstable proteins
E.
increasing the rate of protein synthesis
【多选题】How is a single-pass transmembrane protein retained in the lipid bilayer?
A.
Some remain embedded in the ER membrane as transmembrane proteins. The translocation process for such proteins is more complicated than it is for soluble proteins, as some parts of the polypeptide chain must be translocated completely across the lipid bilayer, whereas other parts remain fixed within the membrane.
B.
In the simplest case, that of a transmembrane protein with a single membrane-spanning segment, the N-terminal signal sequence initiates translocation—as it does for a soluble protein. But the transfer process is then halted by an additional sequence of hydrophobic amino acids, a stop-transfer sequence, further along the polypeptide chain.
C.
At this point, the protein translocator releases the growing polypeptide chain sideways into the lipid bilayer. The N-terminal signal sequence is cleaved off, and the stop-transfer sequence remains in the bilayer, where it forms an α-helical membrane-spanning segment that anchors the protein in the membrane.
D.
As a result, the protein ends up as a single-pass transmembrane protein inserted in the membrane with a defined orientation—the N-terminus on the lumenal side of the lipid bilayer and the C-terminus on the cytosolic side. Once inserted into the membrane, a transmembrane protein will never change its orientation; its cytosolic portion will always remain in the cytosol, even if the protein is subsequently transported to another organelle via vesicle budding and fusion.
【单选题】Benefits of enteral nutrition therapy not observed with parenteral nutrition:
A.
increases bacterial translocation
B.
decreases the amount of nutrients that must be administered since the nutrients are absorbed directly through the gastrointestinal, rather than across the venous system
C.
maintains the structure and function of the gastrointestinal tract
D.
provides bowel rest
E.
b and c
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