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Unformatted text preview: b. act as selective channels for transport c. act as receptor sites for messengers (hormones) 3. peripheral membrane proteins a. lie on inner/outer surface of lipid bilayer b. many have enzymatic role c. structural function in tissue organization C. Primary Functions 1. selective transport of materials in and out of cell 2. maintain cell structure and intracellular climate III. Cytoplasm A. Composition and Structure 1. 90% water 10% protein, carbohydrate, lipid, salts 2. colloids- collections of organic molecules 3. jelly-like fluid surrounding the nucleus 4. criss-crossed by cytoskeleton that holds cell shape B. Function 1. site of many enzyme controlled reactions 2. site of both synthesis and degradation reactions 3. intermediate area for storage and cell transport...
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