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【单选题】
关于巨幼细胞贫血,下列选项中错误的是：A.
是叶酸、维生素B 12 缺乏引起的一种大细胞性贫血
B.
巨幼细胞贫血可表现为对称性肢体麻木,共济失调
C.
除贫血外粒细胞巨变且分叶过多
D.
全身各系统增殖较多的细胞也会发生病变
E.
病因主要是食物营养不够和吸收不良
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举一反三
【判断题】There four general categories of cells: nerve cells, muscle cells, epithelial cells and connective tissue cells.
A.
正确
B.
错误
【多选题】How do cytoskeleton-linked junctions bind epithelial cells robustly to one another and to the basal lamina?
A.
The cell junctions that hold an epithelium together by forming strong mechanical attachments are of three main types.
B.
Adherens junctions and desmosomes bind one epithelial cell to another, while hemidesmosomes bind epithelial cells to the basal lamina.
C.
All of these junctions provide mechanical strength to the epithelium by the same strategy: the proteins that form the junctions span the plasma membrane and are linked inside the cell to cytoskeletal filaments.
D.
In this way, the cytoskeletal filaments are tied into a network that extends from cell to cell across the whole expanse of the epithelial sheet.
【简答题】齿轮联轴器内齿轮在轴向有一定的游动量，以保证两轴都有（）。
【多选题】How do adherens junctions form adhesion belts around epithelial cells?
A.
At an adherens junction, each cadherin molecule is tethered inside its cell, via several linker proteins, to actin filaments.
B.
Often, the adherens junctions form a continuous adhesion belt around each of the interacting epithelial cells; this belt is located near the apical end of the cell, just below the tight junctions.
C.
Bundles of actin filaments are thus connected from cell to cell across the epithelium.
D.
This network of actin filaments also contains myosin filaments and can thus contract, giving the epithelial sheet the capacity to develop tension and to change its shape in remarkable ways.
【单选题】which structure is located at the lateral surface of epithelial cells?
A.
zonula occludens
B.
cilia
C.
microvilli
D.
basement membrane
【简答题】The epithelial cells grow( 不可控制地 )
【单选题】What are the transporters on the apical membrane of small intestinal epithelial cells that can transport oligopeptides into cells ?
A.
Na + -amino acid symporter
B.
K + - amino acid reverse transporter
C.
Na + - peptide symporter
D.
H + - peptide symporter
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