UH BIOL 1361 - Structures of the Cell and Types of Transport (4 pages)

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Structures of the Cell and Types of Transport



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Structures of the Cell and Types of Transport

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The 6th lecture regarding fatty acids, phospholipids, and proteins as well as the different types of transport.


Lecture number:
6
Pages:
4
Type:
Lecture Note
School:
University of Houston
Course:
Biol 1361 - Intro to Biological Science
Edition:
1

Unformatted text preview:

BIOL 1361 1nd Edition Lecture 6 Outline of Last Lecture I Understanding Correlation Table II Cell Membranes and Membrane Transport III Structure of Cell Membrane Outline of Current Lecture I Unsaturated Fatty Acid II Phospholipids III Proteins IV Function Selective Permeability V Osmosis VI Water Balance in Cells problem VII Passive Transport Current Lecture I II Unsaturated Fatty Acid a Side chain has 1 or more double bonds i Carbons NOT fully saturated with H b Double bond causes a kink c Cant pack tightly d Liquid at room temperature Phospholipids a Form a bilayer in aqueous solution b Hydrophobic tails associate with each other c Hydrophilic heads interact with aqueous solution d Form organelle and cell membranes e Cells can change fluidity of membrane i More unsaturated fatty acids more fluid membrane ii More saturated fatty acids less fluid membrane f Steroid i Carbon skeleton 4 rings ii Animal cell membranes contain cholesterol g Cholesterol in membrane changes viscosity a fluids resistance to flow i Low temp cholesterol prevents too much phospholipid packing ii Warmer temp cholesterol prevents too much phospholipid movement These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III Proteins a Transmembrane proteins integral proteins span the phospholipid bilayer b Peripheral proteins attach to inner cytoplasmic or outer extracellular ends of integral proteins IV Function Selective Permeability a Permeability i Property of being porous and allowing something to pass through b Cell membranes are selectively permeable some molecules can cross and other cant c Diffusion i Movement of molecules from high to low concentration ii Spontaneous process no cellular energy required iii Molecules have kinetic energy and are constantly moving iv At equilibrium molecules are distributed equally across membrane v But molecules continue to move back and forth d Molecules that



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