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Bio 1134: Chapter 5: Membrane Structure, Synthesis and Transport

by: Miranda Sennett

Bio 1134: Chapter 5: Membrane Structure, Synthesis and Transport Bio 1134

Marketplace > Mississippi State University > Biological Sciences > Bio 1134 > Bio 1134 Chapter 5 Membrane Structure Synthesis and Transport
Miranda Sennett
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About this Document

Here is Chapter 5 notes. They will be on Exam 2. These notes cover cellular transport and the structure of the cell membrane.
Biology 1
Dr. Evan Kaplan
Class Notes
Biology, Cell, membrane




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This 2 page Class Notes was uploaded by Miranda Sennett on Tuesday September 6, 2016. The Class Notes belongs to Bio 1134 at Mississippi State University taught by Dr. Evan Kaplan in Fall 2016. Since its upload, it has received 41 views. For similar materials see Biology 1 in Biological Sciences at Mississippi State University.

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Date Created: 09/06/16
Bio 1134: Evan Kaplan Chapter 5: Membrane Structures, Synthesis, and Transport Cell Membrane-thin structures made up of a phospholipid bilayer, proteins and carbohydrates.  Protects the cell  Selective Permeability: cell only allows certain molecules through membrane  Not rigid structures, very fluid  Fluid-Mosaic Model- refers to the structure of the cell membrane. A bunch of different parts (i.e. proteins, bilayer, carbohydrates) coming together. Phospholipid Bilayer-framework of the membrane  Phospholipids have hydrophilic heads and hydrophobic tails. Hydrophili c Hydrophob ic  This mix of hydrophilic/hydrophobic structure is expressed as Amphipathic  The bilayer covers the entire cell and determines what enters and exits the cell. Membrane Transport Plays role in permeability Different types of transport o Active Transport: requires energy o Passive Transport: Little to no energy needed Passive Transport: one way to move materials in and out of the cell  Diffusion: movement of a substance from high concentration to low concentration or DOWN THE CONCENTRATION GRADIENT. Goal: to reach equilibrium  Polar ions or charged ions will not be able to pass through membrane due to hydrophobic tails of phospholipid bilayer. Facilitated Transport: proteins that help certain molecules through the cell membrane through channels.  This transport occurs DOWN THE CONCENTRATION GRADIENT.  Selective Osmosis: diffusion of water across selectively permeable membranes.  Three types of concentrations affecting movement of water molecules o Isotonic solution-solute concentration is the same INSIDE AND OUTSIDE of the cell. Water flows equally. IN SOLUTION o Hypertonic solution- solution with HIGHER CONCENTRATION of solute o Hypotonic solution- solution with LOWER CONCENTRATION of solute.  Water moves HYPO to HYPER. Active Transport: movement of a substance AGAINST concentration gradient  Requirements: Energy, movement has to be against concentration gradient, transport protein is needed.  2 types of active transport: o Primary Active Transport: needs energy to move solute against concentration gradient o Secondary Active Transport: pre-existing gradient drives active transport of another solute.  Example of Active Transport: Sodium Potassium Pump Endocytosis vs Exocytosis Endocytosis: Enter cell. Cell creates a “pocket” for a molecule in the cell membrane then pinches off, creating a transport vesicle, allowing the molecule to travel into the cell. Exocytosis: Exit cell. Cell creates vesicle for a molecule and travels to the cell membrane then vesicle is reabsorbed into the membrane, releasing molecule into the outer environment of the cell.


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