CELL MEMBRANE - CELL MEMBRANE 1. Properties: a. Thin,...

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CELL MEMBRANE 1. Properties: a. Thin, flexible membrane b. Semipermeable (selectively permeable) membrane 2. Function: a. Controls the movement of nutrients, wastes across the membrane b. Site of some metabolic reactions - production of energy 3. Composition: a. b. Structure of phospholipids: 1). Phosphate “head” - hydrophilic 2). Fatty acid “tails” - hydrophobic 4. Bilayer of phospholipids forms cell membrane a. Proteins molecules: 1). Some extend through both lipid layers forming pores 2). Some adhere to inside of membrane - usually enzymes 3). Some capable of movement between the lipid layers b. Fluid mosaic model - lipids in fluid state, structure is constantly changing c. Movement across the membrane 1). Passive transport - osmosis, diffusion, facilitated diffusion 2). Active transport . CYTOPLASM 1. Properties: a. Viscous fluid b. Consistency of egg whites 2. Function: a. Filling of cell (“cell sap”) b. Suspension medium c. Site of most metabolic processes
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CELL MEMBRANE - CELL MEMBRANE 1. Properties: a. Thin,...

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