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

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CELL STRUCTURE (Handout available for students) A. Basic cell structures - found in all typical eubacteria B. Special cell structures - found only on certain groups of bacteria OBJECTIVES A. Identify cell structures in drawing B. Describe function each cell structure C. Describe composition each cell part BASIC CELL STRUCTURES : A. CELL WALL 1. Properties: a. Rigid b. Porous 2. Function: a. Shape of the cell b. Protection from differences in the internal and external osmotic pressure 3. Composition : a. Peptidoglycan (murein) - principle compound b. Murein composed of glucose, muramic acid, and polypeptides in “lattice like” arrangement c. Arrangement responsible for rigidity, porosity 4. Variation in composition : a. Detected by doing Gram stain, Acid Fast stain b. Gram positive - 80% murein, multiple layers of murein Gram negative - 40% murein & 40% lipids, lipid layer outside, thin murein layer inside Acid Fast - 20% murein & 60% lipids (waxy)
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Unformatted text preview: 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. Phospholipids & proteins 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...
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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

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