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Proteoglycans perform many sophisticated functions in addition to providing hydrated space around cells. What are their other functions?A.
They can form gels of varying pore size and charge density that act as filters to regulate the passage of molecules through the extracellular medium.
B.
They can bind secreted growth factors and other proteins that serve as extracellular signals for cells.
C.
They can block, encourage, or guide cell migration through the matrix.
D.
In all these ways, the matrix components influence the behavior of cells, often the same cells that make the matrix—a reciprocal interaction that has important effects on cell differentiation and the arrangement of cells in a tissue.
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【简答题】活动过程设计:请设计中班诗歌《小花伞》的活动过程。
【简答题】无胚乳种子有两种情况，其一是种子形成时根本不产生胚乳，如( )和( )科植物；其二是种子发育时，胚乳的养料全部转入( )中，如( )科植物；少数植物的种子在形成发育过程中，珠心组织未被完全吸收，而保留在种子中，形成( )。