Membranes - permeable (Fig. 11) . Membranes serve as...

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Membranes Membrane structures are found surrounding the cell and in eukaryotes there are also membrane bound organelles inside the cell (Fig. 12) . Membranes are permeable to small hydrophobic molecules and small uncharged polar molecules. They are not permeable to large uncharged polar molecules and ions (Fig. 11) . Imbedded into membranes are a variety of proteins (Fig. 13) that provide regulated transport for external signals and molecules that are not nomally membrane
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Unformatted text preview: permeable (Fig. 11) . Membranes serve as attachment sites for enzymes that need to be localized near signal transduction centers (Fig. 11) . Some membranes proteins serve as anchors for structural attachments that maintain the integrity of the cell when it is placed under stress (Fig. 11) . For example, some of the linker molecules include distrophin. Lack of functional linkers such as distrophin are the basis for diseases such as muscular distrophy....
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