I5 - b act as selective channels for transport c act as receptor sites for messengers(hormones 3 peripheral membrane proteins a lie on inner/outer

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Structure of the Cell I. Overview of Animal Cell Structure A. Plasma Membrane B. Cytoplasm C. Major Organelles 1. nucleus 2. ribosomes 3. endoplasmic reticulum (ER) 4. Golgi complex (apparatus) 5. mitochondria 6. lysosomes 7. peroxisomes D. Cytoskeleton, Cilia, Flagella E. Inclusions F. Extracellular Matrix II. The Plasma Membrane A. Chemical Composition 1. 80% phospholipids a. "head" region of molecule is hydrophilic b. "tail" region of molecule is hydrophobic 2. 10% proteins - peripheral and integral (see below) 3. 10% cholesterol, glycolipids, carbohydrates B. Structure 1. phospholipid bilayer - two layers of phospholipids with "head" regions pointing inward and outward while "tail" regions intermingle in the middle of the sandwich. Fluid motion of these molecules.
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Structure of the Cell 2. integral membrane proteins a. float in or completely across lipid bilayer
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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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This note was uploaded on 01/29/2012 for the course SCIE SYG2000 taught by Professor Bernhardt during the Fall '10 term at Broward College.

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I5 - b act as selective channels for transport c act as receptor sites for messengers(hormones 3 peripheral membrane proteins a lie on inner/outer

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