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【简答题】
词一般按字数可以分为____、中调和____三种,
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皮皮学刷刷变学霸
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 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】The stomach produces acids, which denature protein, and pepsin that digests protein. The cell membranes of the epithelial cells lining the stomach contain protein. The protein in the epithelial cells ...
A.
the membranes contain a different type of protein that resists denaturation and digestion.
B.
mucus coats the epithelium.
C.
cell membranes are destroyed but mitotic activity replaces cells with new ones every few hours.
D.
hormones produced by the endocrine cells protect the cell membranes and neutralize the acid pH.
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