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Ch 7 Cell Homework Packet
Ch 7 Cell Homework Packet

... ________________________4. Protein structure that maintains the shape of the cell. ________________________5. For transportation of substances throughout the cell. ________________________6. Phospholipid bilayer surrounding the nucleus. ________________________7. Saclike storage organelle found in b ...
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... Small molecules such as water and oxygen are able to pass through spaces between the lipids that make up the cell membrane. Osmosis: The diffusion of water across a cell membrane is called osmosis. Water molecules move into or out of a cell by osmosis. In osmosis, water molecules diffuse across the ...
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Extracellular matrix



In biology, the extracellular matrix (ECM) is a collection of extracellular molecules secreted by cells that provides structural and biochemical support to the surrounding cells. Because multicellularity evolved independently in different multicellular lineages, the composition of ECM varies between multicellular structures; however, cell adhesion, cell-to-cell communication and differentiation are common functions of the ECM.The animal extracellular matrix includes the interstitial matrix and the basement membrane. Interstitial matrix is present between various animal cells (i.e., in the intercellular spaces). Gels of polysaccharides and fibrous proteins fill the interstitial space and act as a compression buffer against the stress placed on the ECM. Basement membranes are sheet-like depositions of ECM on which various epithelial cells rest.The plant ECM includes cell wall components, like cellulose, in addition to more complex signaling molecules. Some single-celled organisms adopt multicelluar biofilms in which the cells are embedded in an ECM composed primarily of extracellular polymeric substances (EPS).
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