Ch. 7 Cell Membrane BIOL 222
|
|
- Millicent Hunt
- 6 years ago
- Views:
Transcription
1 Ch. 7 Cell Membrane BIOL 222 Overview: Plasma Membrane Plasma boundary that separates the living cell from its surroundings Selec4ve permeability Allowance of some substances to cross more easily than others Cell Membrane Model Fluid mosaic model Membrane is a fluid structure with a mosaic of various proteins embedded in it Phospholipids most abundant lipid in the plasma amphipathic molecules contain hydrophobic and hydrophilic regions 1
2 Fig. 7-2 Hydrophilic head WATER Hydrophobic tail WATER The Fluidity of Membranes Phospholipids Can move within the bilayer Most of the lipids, and some proteins, drig laterally Rarely does a molecule flip-flop transversely across the Lateral movement ( 10 7 times per second) Flip-flop ( once per month) Fig. 7-7 Fibers of extracellular matrix (ECM) PLAY Glycoprotein Carbohydrate Glycolipid EXTRACELLULAR SIDE OF MEMBRANE Cholesterol Microfilaments of cytoskeleton Peripheral proteins Integral protein CYTOPLASMIC SIDE OF MEMBRANE 2
3 Membrane Proteins Peripheral proteins bound to the surface of the Integral proteins Penetrate the hydrophobic core trans proteins Integral proteins that span the Hydrophobic regions of an integral protein consist of one or more stretches of nonpolar amino acids ogen coiled into alpha helices N-terminus C-terminus α Helix EXTRACELLULAR SIDE CYTOPLASMIC SIDE Membrane Proteins Six major funcmons of proteins: Transport Enzymes Signaling molecule Receptor EnzymaMc acmvity ATP Signal transduction Signal transducmon (a) Transport (b) Enzymatic activity (c) Signal transduction Cell-cell recognimon Intercellular joining ARachment to the Glycoprotein (d) Cell-cell recognition (e) Intercellular joining (f) Attachment to the cytoskeleton and extracellular matrix (ECM) cytoskeleton and extracellular matrix (ECM) Membrane Carbohydrates Membrane carbohydrates Used by cells to recognize each other By binding recognimon proteins to surface carbohydrates Glycolipids Carbohydrates covalently bonded to lipids Glycoproteins Carbohydrates bonded to proteins vary among species, individuals, and even cell types in an individual 3
4 Synthesis and Sidedness of Membranes Membranes have dismnct inside and outside faces ER 1 Asymmetrical distribumon Trans glycoproteins Proteins Secretory protein Lipids Associated carbohydrates Glycolipid Golgi 2 apparatus Determined when the is built by the ER and Golgi apparatus Vesicle 3 Components on the inside of ER or Golgi vesicle Secreted protein 4 Plasma : Cytoplasmic face Extracellular face Trans glycoprotein end up on exterior of cell Membrane glycolipid The Permeability of the Lipid Bilayer Hydrophobic (nonpolar) molecules Dissolve in the lipid bilayer and pass through the rapidly Such as hydrocarbons But only very small ones Polar molecules Do not cross the easily Repelled by inner hydrophobic region Such as sugars Transport Proteins Transport proteins Allow passage of hydrophilic substances across the channel proteins hydrophilic channel that certain molecules or ions can use as a tunnel Aquaporins Facilitate the passage of water 4
5 Transport Proteins Carrier proteins Bind to molecules and change shape to shurle them across the Specific for the substance it moves Transport Diffusion Tendency for molecules to spread out evenly into the available space Due to Brownian movement Dynamic equilibrium As many molecules cross one way as cross in the other direcmon Fig Molecules of dye Membrane (cross section) WATER Net diffusion Net diffusion Equilibrium (a) Diffusion of one solute Net diffusion Net diffusion (b) Diffusion of two solutes Net diffusion Net diffusion Equilibrium Equilibrium 5
6 Types of Transport: Passive Simple Diffusion Simple Diffusion Substances move (diffuse) down their concentra4on gradient difference in concentramon of a substance from one area to another Passive transport No energy input required Types of Transport: Passive - Osmosis Osmosis diffusion of water across a selecmvely permeable from the region of lower solute concentramon to the region of higher solute concentramon Water will follow the solutes Fig Lower concentration of solute (sugar) Higher concentration of sugar Same concentration of sugar H 2 O Selectively permeable Osmosis 6
7 Tonicity Water Balance of Cells Without Walls ability of a solumon to cause a cell to gain or lose water Isotonic solumon Solute concentramon outside is the same as that inside the cell No net water movement across the plasma Hypertonic solumon SoluMon with higher solute concentramon Hypotonic solumon SoluMon with lower solute concentramon (a) Animal cell (b) Plant cell Hypotonic solution Lysed Turgid (normal) Isotonic solution Normal Flaccid Hypertonic solution Shriveled Plasmolyzed Water Balance of Cells Without Walls Hypertonic or hypotonic environments create osmomc problems for organisms Osmoregula4on Filling vacuole 50 µm Control of water balance Necessary adaptamon for life in such environments The promst Paramecium (a) A contractile vacuole fills with fluid that enters from a system of canals radiating throughout the cytoplasm. Contracting vacuole Hypertonic to its pond water environment (b) When full, the vacuole and canals contract, expelling fluid from the cell. Has a contracmle vacuole that acts as a pump Water Balance of Cells with Walls Plant cell in a hypotonic solumon Swells unml the wall opposes uptake Cell is now turgid (firm) If isotonic No net movement of water into the cell the cell becomes flaccid (limp) Plant may wilt 7
8 Water Balance of Cells with Walls Plasmolysis Hypertonic environment Plant cells lose water pulls away from the wall usually lethal Types of Transport: Passive - Facilitated Diffusion Facilitated diffusion EXTRACELLULA R FLUID transport proteins facilitate (enable) passive movement of molecules across the plasma Channel protein (a) A channel protein Solute CYTOPLASM Channel proteins corridors that allow a specific molecule or ion to cross the Carrier protein Solute Aquaporins for facilitated diffusion of water (b) A carrier protein Ion channels that open or close in response to a smmulus (gated channels) Types of Transport: Ac4ve Transport Ac4ve transport moves substances against their concentramon gradient Requires energy in the form of ATP Performed by specific proteins embedded in the s 8
9 AcMve transport Types of Transport: Ac4ve Transport allows cells to maintain concentramon gradients that differ from their surroundings Sodium-potassium pump Fig EXTRACELLULAR [ ] high FLUID [K + ] low CYTOPLASM 1 [ ] low [K + ] high 2 P ADP ATP 3 P K + K + K + K + K + 6 K P P Ion Pumps Maintain Membrane Poten4al Membrane poten4al Voltage difference across a Voltage is created by differences in the distribumon of posimve and negamve ions 9
10 Membrane Poten4al Electrogenic pump transport protein that generates voltage across a sodium-potassium pump major electrogenic pump of animal cells + EXTRACELLULAR FLUID proton pump ATP Proton pump + H + H + Main electrogenic pump H + + H + of plants, fungi, and bacteria CYTOPLASM + H + + H + Types of Transport: Ac4ve Transport - Exocytosis Exocytosis Transport vesicles migrate to the, fuse with it, and release their contents Used by secretory cells to export their products Types of Transport: Ac4ve Transport - Endocytosis Endocytosis cell takes in macromolecules by forming vesicles from the plasma reversal of exocytosis, involving different proteins Three types of endocytosis: 1. Phagocytosis ( cellular eamng ) 2. Pinocytosis ( cellular drinking ) 3. Receptor-mediated endocytosis 10
11 Ac4ve Transport: Endocytosis - Phagocytosis Fig. 7-20a PHAGOCYTOSIS EXTRACELLULAR CYTOPLASM FLUID Pseudopodium 1 µm Pseudopodium of amoeba Food or other particle Food vacuole Bacterium Food vacuole An amoeba engulfing a bacterium via phagocytosis (TEM) Fig. 7-20b Ac4ve Transport: Endocytosis - Pinocytosis PINOCYTOSIS Plasma 0.5 µm Pinocytosis vesicles forming (arrows) in a cell lining a small blood vessel (TEM) Vesicle Fig. 7-20c Ac4ve Transport: Receptor Mediated Endocytosis RECEPTOR-MEDIATED ENDOCYTOSIS Receptor Coat protein Coated vesicle Coated pit Ligand Coat protein A coated pit and a coated vesicle formed during receptormediated endocytosis (TEMs) Plasma 0.25 µm 11
12 You should now be able to: 1. Define the following terms: amphipathic molecules, aquaporins, diffusion 2. Explain how fluidity is influenced by temperature and composimon 3. DisMnguish between the following pairs or sets of terms: peripheral and integral proteins; channel and carrier proteins; osmosis, facilitated diffusion, and acmve transport; hypertonic, hypotonic, and isotonic solumons 4. Explain how transport proteins facilitate diffusion 5. Explain how an electrogenic pump creates voltage across a, and name two electrogenic pumps 6. Explain how large molecules are transported across a cell 12
Membrane Structure and Function
Chapter 7 Membrane Structure and Function PowerPoint Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from
More informationBIOLOGY. Membrane Structure and Function CAMPBELL. Reece Urry Cain Wasserman Minorsky Jackson
CAMPBELL BIOLOGY TENTH EDITION Reece Urry Cain Wasserman Minorsky Jackson 7 Membrane Structure and Function Lecture Presentation by Nicole Tunbridge and Kathleen Fitzpatrick Life at the Edge The plasma
More informationMembrane Structure and Function
LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 7 Membrane Structure and Function
More informationCh. 7 Cell Membrane BIOL 222
Ch. 7 Cell Membrane BIOL 222 Overview: Plasma Membrane Plasma membrane boundary that separates the living cell from its surroundings Selec4ve permeability Allowance of some substances to cross more easily
More informationMembrane Structure and Function
Chapter 7 Membrane Structure and Function PowerPoint Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from
More informationMembrane Structure and Function
LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 7 Membrane Structure and Function
More informationChapter 7: Membrane Structure & Function
Chapter 7: Membrane Structure & Function 1. Membrane Structure 2. Transport Across Membranes 1. Membrane Structure Chapter Reading pp. 125-129 What are Biological Membranes? Hydrophilic head WATER They
More informationChapter 7: Membrane Structure & Function. 1. Membrane Structure. What are Biological Membranes? 10/21/2015. Why phospholipids? 1. Membrane Structure
Chapter 7: Membrane Structure & Function 1. Membrane Structure 2. Transport Across Membranes 1. Membrane Structure Chapter Reading pp. 125-129 What are Biological Membranes? Hydrophilic head WATER They
More informationMEMBRANE STRUCTURE AND FUNCTION
MEMBRANE STRUCTURE AND FUNCTION selective permeability permits some substances to cross it more easily than others Figure 7.1 Scientists studying the plasma Reasoned that it must be a phospholipid bilayer
More informationMembrane Structure and Function
LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 7 Membrane Structure and Function
More informationMEMBRANE STRUCTURE AND FUNCTION
MEMBRANE STRUCTURE AND FUNCTION 2.4.2 Membranes organize the chemical activities of cells Membranes provide structural order for metabolism Form most of the cell's organelles Compartmentalize chemical
More informationMembrane Structure and Function
Chapter 7 LECTURE RESENTATIONS For CAMBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, eter V. Minorsky, Robert B. Jackson Membrane Structure and Function
More informationMembrane Structure and Function
Chapter 7 LECTURE RESENTATIONS For CAMBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, eter V. Minorsky, Robert B. Jackson Membrane Structure and Function
More informationMembrane Structure and Function
Chapter 7 Membrane Structure and Function PowerPoint Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from
More informationConcept 7.1: Cellular membranes are fluid mosaics of lipids and proteins
Concept 7.1: Cellular membranes are fluid mosaics of lipids and proteins Lipids: Non-polar substances such as fat that contain C, H, O. Phospholipids: Lipid with phosphate group, very abundant in plasma
More informationMembrane Structure and Function
Membrane Structure and Function Chapter 7 Objectives Define the following terms: amphipathic molecules, aquaporins, diffusion Distinguish between the following pairs or sets of terms: peripheral and integral
More informationLecture Series 5 Cellular Membranes
Lecture Series 5 Cellular Membranes Cellular Membranes A. Membrane Composition and Structure B. Animal Cell Adhesion C. Passive Processes of Membrane Transport D. Active Transport E. Endocytosis and Exocytosis
More informationA. Membrane Composition and Structure. B. Animal Cell Adhesion. C. Passive Processes of Membrane Transport. D. Active Transport
Cellular Membranes A. Membrane Composition and Structure Lecture Series 5 Cellular Membranes B. Animal Cell Adhesion E. Endocytosis and Exocytosis A. Membrane Composition and Structure The Fluid Mosaic
More informationCell Membranes and Signaling
5 Cell Membranes and Signaling Concept 5.1 Biological Membranes Have a Common Structure and Are Fluid A membrane s structure and functions are determined by its constituents: lipids, proteins, and carbohydrates.
More informationBSC Exam I Lectures and Text Pages
BSC 2010 - Exam I Lectures and Text Pages I. Intro to Biology (2-29) II. Chemistry of Life Chemistry review (30-46) Water (47-57) Carbon (58-67) Macromolecules (68-91) III. Cells and Membranes Cell structure
More informationMembrane Structure & Function (Learning Objectives)
Membrane Structure & Function (Learning Objectives) Review the basic function and biochemical composition of the plasma membrane. Learn the fluid state of membranes and the movement of its lipids and proteins.
More informationLecture Series 4 Cellular Membranes
Lecture Series 4 Cellular Membranes Reading Assignments Read Chapter 11 Membrane Structure Review Chapter 21 pages 709-717 717 (Animal( Cell Adhesion) Review Chapter 12 Membrane Transport Review Chapter
More informationCONCEPT 5.1: Cellular membranes are fluid mosaics of lipids and proteins
Ch 5 Membrane Transport and Signaling Overview The plasma separates the living cell from its surroundings The plasma exhibits selective permeability, allowing some substances to cross it more easily than
More informationMEMBRANE STRUCTURE & FUNCTION
MEMBRANE STRUCTURE & FUNCTION Chapter 8 KEY CONCEPTS Cellular s are fluid mosaics of lipids and proteins Membrane structure results in selective permeability Passive transport is diffusion of a substance
More informationChapter 7: Membrane Structure and Function. Key Terms:
Key Terms: Selectively permeable Fluid mosaic model Amphipathic Phospholipid Bilayer Hydrophilic Hydrophobic Phosphate head Fatty acid tail Davson-Danielli Singer-Nicolson Freeze-Fracture EM Unsaturated
More informationMembrane Structure and Function. Cell Membranes and Cell Transport
Membrane Structure and Function Cell Membranes and Cell Transport 1895 1917 1925 Membrane models Membranes are made of lipids Phospholipids can form membranes Its actually 2 layers - there are proteins
More informationConcept 7.5: Bulk transport across the plasma membrane occurs by exocytosis and endocytosis
Concept 7.5: Bulk transport across the plasma membrane occurs by exocytosis and endocytosis Small molecules and water enter or leave the cell through the lipid bilayer or by transport proteins Large molecules,
More informationCHAPTER 8 MEMBRANE STUCTURE AND FUNCTION
CHAPTER 8 MEMBRANE STUCTURE AND FUNCTION Plasma Membrane Plasma membrane is selectively permeable, (allowing some substances to cross more easily than others) PM is flexible bends and changes shape
More information5 Membrane Transport and Cell Signaling
CAMPBELL BIOLOGY IN FOCUS Urry Cain Wasserman Minorsky Jackson Reece 5 Membrane Transport and Cell Signaling Lecture Presentations by Kathleen Fitzpatrick and Nicole Tunbridge Overview: Life at the Edge
More informationChapter 7: Membrane Structure and Function
Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. Phospholipids are amphipathic. Explain what this means. Name Period Amphipathic means
More informationChapter 7: Membrane Structure and Function
Chapter 7: Membrane Structure and Function Name Period Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes.
More informationMembrane Transport and Cell Signaling
CAMPBELL BIOLOGY IN FOCUS URRY CAIN WASSERMAN MINORSKY REECE 5 Membrane Transport and Cell Signaling Lecture Presentations by Kathleen Fitzpatrick and Nicole Tunbridge, Simon Fraser University SECOND EDITION
More informationChapter 7-3 Cell Boundaries
Chapter 7-3 Cell Boundaries The Plasma Membrane: Cell Membrane Regulates what enters and leaves the cell. Provides protection and support. Highly selective barrier!!!! What the plasma membrane is made
More informationCell Membrane Structure and Function. What is the importance of having a cell membrane?
Cell Membrane Structure and Function What is the importance of having a cell membrane? I. Membrane Structure a. Membranes contain proteins, lipids, and carbohydrates (which are all types of macromolecules)
More informationPhospholipid Bilayer Hydrophilic head Hydrophobic tail Molecules with hydrophilic and hydrophobic parts are called Ampipathic molecules
Plasma Membrane The membrane at the boundary of every cell Functions as a selective barrier for the passage of materials in and out of cells Membrane Composition Phospholipids Proteins Carbohydrates Cholesterol
More informationWhat do you remember about the cell membrane?
Cell Membrane What do you remember about the cell membrane? Cell (Plasma) Membrane Separates the internal environment of the cell from the external environment All cells have a cell membrane Selectively
More informationMembrane Structure and Function
Membrane Structure and Function Check Your Gummy Bears Ø Take Day One measurements l Same measurements you took yesterday Ø What type solution was the gummy bear in? Hyper, Hypo, or Isotonic? Ø Put your
More informationChapter 7 Membrane Structure and Function
Chapter 7 Membrane Structure and Function CELL MEMBRANE: Basics: Regulates flow in and out of the cell Composed of phospholipids and proteins - some carbohydrates and lipids SELECTIVELY PERMEABLE - allows
More informationWhat is the Surface Area to Volume Ratio of a sphere with a radius of 5mm? Of 10 mm? What sphere can eliminate wastes and move materials quicker?
Warm Up What is the Surface Area to Volume Ratio of a sphere with a radius of 5mm? Of 10 mm? What sphere can eliminate wastes and move materials quicker? Cell Membrane and Function Chapter 7 Big Idea #2:
More informationMembrane Structure and Function. Selectively permeable membranes are key to the cell's ability to function
Membrane Structure and Function Selectively permeable membranes are key to the cell's ability to function Amphipathic Molecules Have both hydrophilic and hydrophobic regions Phospholipids have hydrophilic
More informationChapter 7 Membrane Structure and Function. The plasma membrane surrounds the living cells from their surroundings.
Chapter 7 Membrane Structure and Function The plasma membrane surrounds the living cells from their surroundings. Only 8 nm thick (8,000 to equal the thickness of a sheet of paper) Controls passage of
More informationMembrane Structure and Function
Membrane Structure and Function What You Must Know: Why membranes are selectively permeable. The role of phospholipids, proteins, and carbohydrates in membranes. How water will move if a cell is placed
More informationLecture Series 4 Cellular Membranes. Reading Assignments. Selective and Semi-permeable Barriers
Lecture Series 4 Cellular Membranes Reading Assignments Read Chapter 11 Membrane Structure Review Chapter 12 Membrane Transport Review Chapter 15 regarding Endocytosis and Exocytosis Read Chapter 20 (Cell
More informationCHAPTER 8 MEMBRANE STRUCTURE AND FUNCTION
CHAPTER 8 MEMBRANE STRUCTURE AND FUNCTION Section B: Traffic Across Membranes 1. A membrane s molecular organization results in selective permeability 2. Passive transport is diffusion across a membrane
More informationMembrane Structure and Function
Chapter 7 Membrane Structure and Function Lecture Outline Overview: Life at the Edge The plasma membrane separates the living cell from its nonliving surroundings. This thin barrier, 8 nm thick, controls
More informationMembrane Structure and Function
Chapter 7 Membrane Structure and Function PowerPoint Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from
More informationThe Plasma Membrane. 5.1 The Nature of the Plasma Membrane. Phospholipid Bilayer. The Plasma Membrane
5.1 The Nature of the Plasma Membrane The Plasma Membrane Four principal components in animals Phospholipid bilayer Molecules of cholesterol interspersed within the bilayer. Membrane proteins embedded
More informationPlasma Membrane Structure and Function
Plasma Membrane Structure and Function The plasma membrane separates the internal environment of the cell from its surroundings. The plasma membrane is a phospholipid bilayer with embedded proteins. The
More informationCH 7.2 & 7.4 Biology
CH 7.2 & 7.4 Biology LABEL THE MEMBRANE Phospholipids Cholesterol Peripheral proteins Integral proteins Cytoskeleton Cytoplasm Extracellular fluid Most of the membrane A phospholipid bi-layer makes up
More informationCh7: Membrane Structure & Function
Ch7: Membrane Structure & Function History 1915 RBC membranes studied found proteins and lipids 1935 membrane mostly phospholipids 2 layers 1950 electron microscopes supported bilayer idea (Sandwich model)
More informationBiology Kevin Dees. Chapter 7 Membrane Structure and Function
Chapter 7 Membrane Structure and Function The plasma membrane surrounds the living cells from their surroundings. Only 8 nm thick (8,000 to equal the thickness of a sheet of paper) Controls passage of
More informationOutline. Membrane Structure and Function. Membrane Models Fluid-Mosaic. Chapter 5
Membrane Structure and Function Chapter 5 Membrane Models Fluid-Mosaic Outline Plasma Membrane Structure and Function Protein Functions Plasma Membrane Permeability! Diffusion! Osmosis! Transport Via Carrier
More informationLecture Series 4 Cellular Membranes
Lecture Series 4 Cellular Membranes Reading Assignments Read Chapter 11 Membrane Structure Review Chapter 12 Membrane Transport Review Chapter 15 regarding Endocytosis and Exocytosis Read Chapter 20 (Cell
More informationWhat kind of things must pass into and out of cells?? Be careful not to go too fast.
1. A membrane s molecular organization results in selective permeability What kind of things must pass into and out of cells?? Be careful not to go too fast. Permeability of a molecule through a membrane
More informationPlasma Membrane Structure and Function
Plasma Membrane Structure and Function Chapter 7 Image from: http://www.biologie.uni-hamburg.de/b-online/ge22/03.gif Slide show modified from: http://www.explorebiology.com/pptap/2005/ http://facstaff.bloomu.edu/gdavis/links%20100.htm
More informationThe Cell Membrane AP Biology
The Cell Membrane AP Biology! 2007-2008 Overview! Cell membrane separates living cell from nonliving surroundings " thin barrier = 8nm thick! Controls traffic in & out of the cell " selectively permeable
More informationAP Biology. Overview. The Cell Membrane. Phospholipids. Phospholipid bilayer. More than lipids. Fatty acid tails. Phosphate group head
Overview The Cell Membrane Cell separates living cell from nonliving surroundings thin barrier = 8nm thick Controls traffic in & out of the cell selectively permeable allows some substances to cross more
More informationCWDHS Mr. Winch Grade 12 Biology
The Cell Membrane Overview Cell separates living cell from nonliving surroundings thin barrier = 8nm thick Controls traffic in & out of the cell selectively permeable allows some substances to cross more
More informationThe Cell Membrane. Cell membrane separates living cell from nonliving surroundings. Controls traffic in & out of the cell
The Cell Membrane 1 Overview Cell membrane separates living cell from nonliving surroundings thin barrier = 8nm thick Controls traffic in & out of the cell selectively permeable allows some substances
More informationChapter 5. The Working Cell. Lecture by Richard L. Myers
Chapter 5 The Working Cell PowerPoint Lectures for Biology: Concepts & Connections, Sixth Edition Campbell, Reece, Taylor, Simon, and Dickey Lecture by Richard L. Myers MEMBRANE STRUCTURE AND FUNCTION
More informationCell Transport & the Cell Membrane
Cell Transport & the Cell Membrane I. Cell Membrane A. Structure Structure of the cell membrane is referred to as the Fluid Mosaic Model. It is made up of lipids, proteins and carbohydrates. The membrane
More informationHow Things Get In and Out of Cells, or gummy bears, zip lock bags or whatever!
How Things Get In and Out of Cells, or gummy bears, zip lock bags or whatever! SC.912.L.14.3 Benchmark Clarifications: Students will compare and/or contrast the structures found in plant cells and in animal
More informationBio 111 Study Guide Chapter 5 Membrane Transport and Cell Signaling
Bio 111 Study Guide Chapter 5 Membrane Transport and Cell Signaling BEFORE CLASS: Reading: Read the whole chapter from pp. 100-119. There are many great figures in this chapter. Make sure you study all
More informationWhat kind of things must pass into and out of cells?? Be careful not to go too fast.
1. A membrane s molecular organization results in selective permeability What kind of things must pass into and out of cells?? Be careful not to go too fast. Permeability of a molecule through a membrane
More informationPhospholipids. Extracellular fluid. Polar hydrophilic heads. Nonpolar hydrophobic tails. Polar hydrophilic heads. Intracellular fluid (cytosol)
Module 2C Membranes and Cell Transport All cells are surrounded by a plasma membrane. Eukaryotic cells also contain internal membranes and membrane- bound organelles. In this module, we will examine the
More informationMembrane Structure and Function
BIOL1040 Page 1 Membrane Structure and Function Friday, 6 March 2015 2:58 PM Cellular Membranes Fluid mosaics of lipids and proteins Phospholipids - abundant Phospholipids are amphipathic molecules (has
More informationThe Cell Membrane. Phospholipids. Chapter 7: Arranged as a Phospholipid bilayer. Cell membrane defines cell! Cell membrane separates living cell from
Chapter 7: The Cell Membrane Phospholipids! Amphipathic Molecules: " Phosphate head! hydrophilic " Fatty acid tails! Hydrophobic! Arranged as a bilayer Phosphate attracted to water Fatty acid repelled
More informationPhospholipids. Phosphate head. Fatty acid tails. Arranged as a bilayer. hydrophilic. hydrophobic. Phosphate. Fatty acid. attracted to water
The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer Phosphate attracted to water Fatty acid repelled by water I want you to remember: Structure
More informationChapter 4. Membrane Structure and Function. Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Chapter 4 Membrane Structure and Function Copyright The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 1 4.1 Plasma Membrane Structure and Function Regulates the entrance
More informationChapter 8. Cell Membranes
Chapter 8 Cell Membranes Composition of cell membrane: the fluid mosaic model 流體鑲嵌模型 ---structural element (lipid脂質) Page 197 ---carry out the specific functions (protein蛋白質) Phospholipids 磷脂質 Are the
More informationMovement across the Membrane
Chapter 8. Movement across the Membrane 2003-2004 1 Cell membrane Cells have an inside & an outside Cell membrane is the boundary Can it be an impenetrable boundary? NO! Why not? The cell needs materials
More informationDiffusion across cell membrane
The Cell Membrane and Cellular Transport Diffusion across cell membrane Cell membrane is the boundary between inside & outside separates cell from its environment Can it be an impenetrable boundary? NO!
More informationMembrane Structure and Function - 1
Membrane Structure and Function - 1 The Cell Membrane and Interactions with the Environment Cells interact with their environment in a number of ways. Each cell needs to obtain oxygen and other nutrients
More informationThe Cell Membrane & Movement of Materials In & Out of Cells PACKET #11
1 February 26, The Cell Membrane & Movement of Materials In & Out of Cells PACKET #11 Introduction I 2 Biological membranes are phospholipid bilayers with associated proteins. Current data support a fluid
More informationTransport: Cell Membrane Structure and Function. Biology 12 Chapter 4
Transport: Cell Membrane Structure and Function Biology 12 Chapter 4 FLUID-MOSAIC MODEL OF MEMBRANE STRUCTURE The cell membrane (plasma membrane) is made of two layers of phospholipid molecules (bilayer)
More informationDivision Ave High School Ms. Foglia AP Biology
The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer Phosphate attracted to water Fatty acid repelled by water 2007-2008 Aaaah, one of those structure
More informationChapter 8. Movement across the Cell Membrane. diffusion. Diffusion of 2 solutes. Cell (plasma) membrane. Diffusion 9/7/2012
Chapter 8. Movement across the Cell Membrane Diffusion Diffusion of 2 solutes Each substance diffuses down its own concentration gradient, independent of concentration gradients of other substances Diffusion
More informationUnit 1 Matter & Energy for Life
Unit 1 Matter & Energy for Life Chapter 2 Interaction of Cell Structure Biology 2201 Primary Membrane Function: Homeostasis Conditions in the cell must remain more or less constant under many different
More informationChapter 7. Movement across the Cell Membrane
Chapter 7 Movement across the Cell Membrane 2005-2006 Diffusion 2nd Law of Thermodynamics governs biological systems u Universe tends towards disorder Diffusion u movement from high low concentration Diffusion
More informationUnit 1 Matter & Energy for Life
Unit 1 Matter & Energy for Life Chapter 2 Interaction of Cell Structures Biology 2201 Primary Membrane Function: Homeostasis Section 2.2 Conditions in the cell must remain more or less constant under many
More informationMEMBRANE STRUCTURE AND TRAFFIC. Cell Membrane Structure and Function
MEMBRANE STRUCTURE AND TRAFFIC Cell Membrane Structure and Function 4.1 How Is the Structure of a Membrane Related to Its Function? 4.1.1 The Plasma Membrane Isolates the Cell While Allowing Communication
More informationThe Cell Membrane. Usman Sumo Friend Tambunan Arli Aditya Parikesit. Bioinformatics Group Faculty of Mathematics and Science University of Indonesia
The Cell Membrane Usman Sumo Friend Tambunan Arli Aditya Parikesit Bioinformatics Group Faculty of Mathematics and Science University of Indonesia Overview Cell membrane separates living cell from nonliving
More informationThe Plasma Membrane - Gateway to the Cell
The Plasma Membrane - Gateway to the Cell 1 Photograph of a Cell Membrane 2 Cell Membrane The cell membrane is flexible and allows a unicellular organism to move 3 Homeostasis Balanced internal condition
More informationBio 111 Study Guide Chapter 7 Membrane Structure and Function
Bio 111 Study Guide Chapter 7 Membrane Structure and Function BEFORE CLASS: Reading: Read the whole chapter from p. 124 138. Note the differences between Figures 7.2 and 7.3. We have come a long way in
More informationUnit 1 Matter & Energy for Life
Unit 1 Matter & Energy for Life Chapter 2 Interaction of Cell Structure Biology 2201 Sept. 2011 Primary Membrane Function: Homeostasis Section 2.2 Conditions in the cell must remain more or less constant
More informationChapter 4: Cell Membrane Structure and Function
Chapter 4: Cell Membrane Structure and Function Plasma Membrane: Thin barrier separating inside of cell (cytoplasm) from outside environment Function: 1) Isolate cell s contents from outside environment
More informationDelve AP Biology Lecture 4: 10/9/11 Melissa Ko and Anne Huang
Today s Agenda: I. Review of organelles II. More important organelles III. Plasma membrane structure IV. Diffusion and transport Delve AP Biology Lecture 4: 10/9/11 Melissa Ko and Anne Huang I. Review
More informationCELL TRANSPORT and THE PLASMA MEMBRANE. SB1d. Explain the impact of water on life processes (i.e., osmosis, diffusion).
CELL TRANSPORT and THE PLASMA MEMBRANE SB1d. Explain the impact of water on life processes (i.e., osmosis, diffusion). What if What would happen if an organism could not get energy or get rid of wastes?
More information10/28/2013. Double bilayer of lipids with imbedded, dispersed proteins Bilayer consists of phospholipids, cholesterol, and glycolipids
Structure of a Generalized Cell MEMBRANES Figure 3.1 Plasma Membrane Fluid Mosaic Model Separates intracellular fluids from extracellular fluids Plays a dynamic role in cellular activity Glycocalyx is
More informationMonday, September 30 th :
Monday, September 30 th : QUESTION TO PONDER: Differentiate between a pro- and eukaryotic organism. List 4 organelles that each type of organism has in common. The Cell Membrane Modified from Kim Foglia
More informationPlasma Membrane & Movement of Materials in Cells
Plasma Membrane & Movement of Materials in Cells Why do cells need to control what enters and exits? Plasma membrane boundary between the cell and its environment Homeostasis maintaining the cells environment
More informationChapter 5: Cell Membranes and Signaling
Chapter Review 1. For the diagram below, explain what information you would use to determine which side of the membrane faces the inside of the cell and which side faces the extracellular environment.
More informationMembrane Structure and Function
Chapter 7 Membrane Structure and Function Lecture Outline Overview: Life at the Edge The plasma membrane separates the living cell from its surroundings. This thin barrier, 8 nm thick, controls traffic
More informationMaintained by plasma membrane controlling what enters & leaves the cell
CELL TRANSPORT AND HOMEOSTASIS Homeostasis Balanced internal condition of cells Also called equilibrium Maintained by plasma membrane controlling what enters & leaves the cell Functions of Plasma Membrane
More informationChapter 4 Skeleton Notes: Membrane Structure & Function
Chapter 4 Skeleton Notes: Membrane Structure & Function Overview/Objectives 4.1 Plasma Membrane Structure & Function o Structure and Function of the PM o Major functions of proteins 4.2- Permeability of
More informationUNIT 4 CELL BOUNDARIES AND TRANSPORT. Unit 4 test: October 16, 2018
UNIT 4 CELL BOUNDARIES AND TRANSPORT Unit 4 test: October 16, 2018 Cell Wall CELL BOUNDARIES support protect & the cell cell membrane Lies outside of the Is made of & carbohydrates proteins Plant cell
More informationThe Cell Membrane & Movement of Materials In & Out of Cells PACKET #11
1 The Cell Membrane & Movement of Materials In & Out of Cells PACKET #11 Introduction I 2 Biological membranes are phospholipid bilayers with associated proteins. Current data support a fluid mosaic model
More informationDiffusion. Chapter 7. Movement across the Cell Membrane. Cell (plasma) membrane. diffusion. Building a membrane. Diffusion of 2 solutes
WH Chapter 7 Diffusion Move for HIGH to LOW concentration passive transport no energy needed Movement across the Cell Membrane 2005-2006 diffusion osmosis Diffusion 2nd Law of Thermodynamics governs biological
More informationHomeostasis, Transport & The Cell Membrane. Chapter 4-2 (pg 73 75) Chapter 5
Homeostasis, Transport & The Cell Membrane Chapter 4-2 (pg 73 75) Chapter 5 Unit 5: Lecture 1 Topic: The Cell Membrane Covers: Chapter 5, pages 95-96 Chapter 4, pages 73-75 The Cell Membrane The chemistry
More information