BIOL 158: BIOLOGICAL CHEMISTRY II
|
|
- Sheryl Hoover
- 5 years ago
- Views:
Transcription
1 BIOL 158: BIOLOGICAL CHEMISTRY II Lecture 1: Membranes Lecturer: Christopher Larbie, PhD
2 Introduction
3 Introduction Cells and Organelles have membranes Membranes contain lipids, proteins and polysaccharides in a bilayer
4 Membranes Proteins Three Types are present Integral Proteins Peripheral Proteins Transmembrane proteins Positioning of the protein depends on the hydrophobicity of the protein
5 Membrane Proteins serve six (6) different functions. Transport Enzymatic Activity
6 Signal Transduction Cell-cell recognition
7 Intercellular Joining Attachment to the cytoskeleton and extracellular matrix
8 Surface Proteins and Diseases, e.g. HIV/AIDS Infection CD Cluster of Differentiation (Type of T-cell receptor), CCR5 Chemokine Receptor type 5 (Receptor on WBCs)
9 Membrane Carbohydrates and their function Carbohydrates present in membranes are oligosaccharides covalently attached to proteins to form glycoproteins and to a lesser extent to lipids to form glycolipids. They are mainly gangliosides which contain galactose, mannose, glucose, N-acetyl glucosamine and N-acetyl galactosamine and are found on the exterior side of the plasma membrane. Roles of the membrane carbohydrates include cell-cell recognition, adhesion and receptor action.
10 Cell-cell recognition, a cell s ability to distinguish one type of neighbouring cell from another, is crucial to the functioning of an organism. It is important in the sorting of cells It is also the basis for the rejection of foreign cells by the immune system
11 The diversity of the molecules and their location on the cell s surface enable membrane carbohydrates to function as markers that distinguish one cell from another. For example, the four human blood types designated A, B, AB, and O reflects variation in the carbohydrate part of glycoproteins on the surface of red blood cells
12 Membrane Lipids and Function A primary role of lipids is in the formation of the permeability barrier of cells and subcellular organelles in the form of a lipid bilayer. Lipids are glycerol-based phospholipid Five kinds of phospholipid predominate: phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, phosphatidylglycerols, and sphingomyelin.
13 Membrane Fluidity Membranes are not static sheets of molecules locked rigidly in place. A membrane is held together primarily by hydrophobic interactions, which are much weaker than covalent bonds. Most of the lipids and some of the proteins can shift about laterally.
14 A membrane remains fluid as temperature decreases until finally the phospholipids settle into a closely packed arrangement and the membrane solidifies. The temperature at which a membrane solidifies depends on the types of lipids it is made of.
15 Cholesterol is wedged between phospholipid molecules in the plasma membranes of animal cells. At relatively high temperatures at 37 C, the body temperature of humans, for example cholesterol makes the membrane less fluid by restraining phospholipid movement. However, because cholesterol also hinders the close packing of phospholipids, it lowers the temperature required for the membrane to solidify.
16 The Fluid Mosaic Model of Biological Membranes
17 Transport across membranes
18 Passive Diffusion The diffusion of a substance across a biological membrane is called passive transport because the cell does not have to expend energy to make it happen. The concentration gradient itself represents potential energy and drives diffusion.
19 Membranes are selectively permeable and therefore have different effects on the rates of diffusion of various molecules. In the case of water, aquaporins allow water to diffuse very rapidly across the membranes of certain cells.
20 Diffusion in gaseous exchange
21 Osmosis and Water Balance of Cells
22 Movement of fluids by diffusion is described by Fick s first law of diffusion; J = kd 1 C 2 C 1 L Where J = net rate of transport in moles/cm 2 /sec. (C 2 C 1 ) = concentration difference across membrane in mol/cm 3 L = thickness of the membrane in cm D 1 = diffusion coefficient of the diffusing substance in membrane in cm 2 /s k = partition coefficient for the diffusing material between lipid and water i.e. ratio of solubilities of the substance in lipid and water. For ions and hydrophilic substance, K is very small.
23 Facilitated Diffusion The plasma membranes of both prokaryotic and eukaryotic cells have mechanisms for the translocation of various substances including sugars, amino acids, metabolic intermediates, inorganic ions and even H +.
24 It is now known that these membranes contain transport systems that play important role in the uptake of nutrients, maintenance of ionic concentrations and control of metabolism. These systems involve intrinsic or trans-membrane proteins and are classified on the basis of the mechanisms of translocation of substances across membranes and the energetics of the system. They all involve protein transporters.
25 Membrane transport systems There are two main modes of facilitated diffusion, passive and active mediated transport systems (transporter, translocase, permease, pump) The protein transporters for the two modes have a number of common characteristics; Each facilitates the movement of a molecule or molecules through the lipid bilayer at a significantly faster rate than can be explained for by passive or simple diffusion. Transporters demonstrate saturation kinetics, i.e. as the concentration of the substance to be translocated increase, the rate of transport increases but it reaches a maximum when the substance saturates the transporter. Most transporters have a high degree of structural and stereospecificity for the substance transported.
26 Mechanism of Transport of solute molecules Recognition and Binding Translocation or transport Dissociation or Release Recovery
27 Mechanisms of transport Uniport Symport Antiport
28 Types of Membrane Translocation Systems Channels are selective for specific inorganic cations and anions Pores are not selective but permit organic and inorganic molecules to pass through membrane.
29 Gap junctions etc
30 Passive Mediated Transport Systems of Glucose and The Na + -K + Active Transport System
31 Passive Mediated Transport Systems - Cl - and HCO 3 - Antiport Mechanism
32 Active Mediated Transport Systems Active transporters are classified as either primary active transporters if they utilize ATP directly or secondary active transporters if a trans-membrane chemical gradient of Na + or H + is utilized. The transporters that utilize ATP are referred to as ATPases because the translocation is linked to the hydrolysis of ATP to ADP and inorganic phosphate.
33 ATPases are classified as P, V, or F type transporters. P-type translocases are phosphorylated and dephosphorylated during the transport activity. V-type is found in the membranes of lysosomes, Golgi vesicles and secretory vesicles and is responsible for the acidification of the interior of these vesicles. F-type is found in the mitochondria and chloroplasts and is involved in the synthesis of ATP.
34 The Na + -K + Active Transport System
35 Ca 2+ Translocation Active Transport System
36 Transportation by Chemical Modification Transport of Amino Acids
37 Another group translocation mechanism is used for the uptake of sugars in bacteria. The pathway involves phosphorylation of the sugar using PEP as the phosphate donor (phosphoenol pyruvate phosphotransferase system [PTS]).
38 Ionophores These are antibiotics of bacterial origin that facilitates the movement of monovalent and divalent inorganic ions across biological membranes. They are divided into two major groups; Mobile carriers which are ionophores that diffuse back and forth across the membrane carrying the ions from one side of the membrane to the other (e.g. valinomycin). This mode of transport is affected by the fluidity of the membrane Channel formers that form a channel that traverses the membrane through which ions can diffuse (e.g. gramicidin A). Both types translocate ions by passive mediated transport mechanism.
39 Valinomycin: Produced by the Streptomyces sp and consists of an inner hydrophobic cavity which can accommodate K + ions but not others.
40 Gramicidine A: Two molecules of gramicidin A form a channel and the dimmer is in constant equilibrium with the free monomer form.
41 Bulk transport across the plasma membrane occurs by exocytosis and endocytosis Water and small solutes enter and leave the cell by diffusing through the lipid bilayer of the plasma membrane or by being pumped or moved across the membrane by transport proteins. However, large molecules, such as proteins and polysaccharides, as well as larger particles, generally cross the membrane in bulk by mechanisms that involve packaging in vesicles. Like active transport, these processes require energy
42 Exocytosis Examples, the cells in the pancreas that make insulin secrete it into the extracellular fluid by exocytosis. neurons (nerve cells) use exocytosis to release neurotransmitters that signal other neurons or muscle cells. when plant cells are making walls, exocytosis delivers proteins and carbohydrates from Golgi vesicles to the outside of the cell
43 Endocytosis
Cell Membranes Valencia college
6 Cell Membranes Valencia college 6 Cell Membranes Chapter objectives: The Structure of a Biological Membrane The Plasma Membrane Involved in Cell Adhesion and Recognition Passive Processes of Membrane
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
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 informationMembrane Structure and Membrane Transport of Small Molecules. Assist. Prof. Pinar Tulay Faculty of Medicine
Membrane Structure and Membrane Transport of Small Molecules Assist. Prof. Pinar Tulay Faculty of Medicine Introduction Cell membranes define compartments of different compositions. Membranes are composed
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 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 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 transport. Pharmacy Dr. Szilvia Barkó
Membrane transport Pharmacy 04.10.2017 Dr. Szilvia Barkó Cell Membranes Cell Membrane Functions Protection Communication Import and and export of molecules Movement of the cell General Structure A lipid
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 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 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 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 informationPLASMA MEMBRANE. Submitted by:- DR.Madhurima Sharma PGGCG-II,Chandigarh
PLASMA MEMBRANE Submitted by:- DR.Madhurima Sharma PGGCG-II,Chandigarh LIPID COMPONENTS OF THE PLASMA MEMBRANE The outer leaflet consists predominantly of phosphatidylcholine, sphingomyelin, and glycolipids,
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 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 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 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 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 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 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 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
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 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 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 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 informationChapter 2 Transport Systems
Chapter 2 Transport Systems The plasma membrane is a selectively permeable barrier between the cell and the extracellular environment. It permeability properties ensure that essential molecules such as
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 informationCell membranes. Stef Elorriaga 4/11/2016 BIO102
Cell membranes Stef Elorriaga 4/11/2016 BIO102 Announcements Lab report 2 is due now Quiz 2 is on Wednesday on cells, part of the cells, plasma membrane, and enzymes Outline of the day Activity on the
More informationThe Cell Membrane. Lecture 3a. Overview: Membranes. What is a membrane? Structure of the cell membrane. Fluid Mosaic Model. Membranes and Transport
Lecture 3a. The Cell Membrane Membranes and Transport Overview: Membranes Structure of cell membranes Functions of cell membranes How things get in and out of cells What is a membrane? Basically, a covering
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 informationMembranes. Chapter 5
Membranes Chapter 5 Membrane Structure The fluid mosaic model of membrane structure contends that membranes consist of: -phospholipids arranged in a bilayer -globular proteins inserted in the lipid bilayer
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 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 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 informationMembrane Structure. Membrane Structure. Membrane Structure. Membranes
Membrane Structure Membranes Chapter 5 The fluid mosaic model of membrane structure contends that membranes consist of: -phospholipids arranged in a bilayer -globular proteins inserted in the lipid bilayer
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 informationComprehensive and Easy Course Notes for BIOL1040 Exams and Assessment
Comprehensive and Easy Course Notes for BIOL1040 Exams and Assessment MODULE 1: PRINCIPLES OF CELL FUNCTION Membrane Structure & Function Cellular membranes are fluid mosaics of lipids and proteins Phospholipids
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 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 informationMembrane Structure. Membrane Structure. Membranes. Chapter 5
Membranes Chapter 5 Membrane Structure The fluid mosaic model of membrane structure contends that membranes consist of: -phospholipids arranged in a bilayer -globular proteins inserted in the lipid bilayer
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 informationCell Membrane: a Phospholipid Bilayer. Membrane Structure and Function. Fluid Mosaic Model. Chapter 5
Membrane Structure and Function Chapter 5 Cell Membrane: a Phospholipid Bilayer Phospholipid Hydrophilic Head Hydrophobic Tail Lipid Bilayer Fluid Mosaic Model Mixture of saturated and unsaturated fatty
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 informationBiomembranes structure and function. B. Balen
Biomembranes structure and function B. Balen All cells are surrounded by membranes Selective barrier But also important for: 1. Compartmentalization 2. Biochemical activities 3. Transport of dissolved
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 informationDiffusion, Osmosis and Active Transport
Diffusion, Osmosis and Active Transport Particles like atoms, molecules and ions are always moving Movement increases with temperature (affects phases of matter - solid, liquid, gas) Solids - atoms, molecules
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 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 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 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 informationLipids and Membranes
Lipids and Membranes Presented by Dr. Mohammad Saadeh The requirements for the Pharmaceutical Biochemistry I Philadelphia University Faculty of pharmacy Biological membranes are composed of lipid bilayers
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 informationMembranes. Chapter 5. Membrane Structure
Membranes Chapter 5 Membrane Structure Lipid Bilayer model: - double phospholipid layer - Gorter & Grendel: 1925 Fluid Mosaic model: consist of -phospholipids arranged in a bilayer -globular proteins inserted
More informationKey Concepts - All Cells Use Energy Energy Conversions - Reactions Absorb or Release Energy Endergonic, Exergonic - ATP is Cellular Energy
Key Concepts - All Cells Use Energy Energy Conversions - Reactions Absorb or Release Energy Endergonic, Exergonic - ATP is Cellular Energy ATP Cycle - Enzymes Speed Up Reactions Enzyme Function, Factors
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 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 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 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 3b Cells Membrane transport - Student Notes
Chapter 3b Cells Membrane transport - Student Notes 1 Transport are permeable Some molecules the membrane; others do 2 Types of Membrane Transport processes No cellular required Substance its processes
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 informationChapter 7: Membranes
Chapter 7: Membranes Roles of Biological Membranes The Lipid Bilayer and the Fluid Mosaic Model Transport and Transfer Across Cell Membranes Specialized contacts (junctions) between cells What are the
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 informationCytoskeleton. Provide shape and support for the cell. Other functions of the cytoskeleton. Nucleolus. Nucleus
Chapter 4: Cell Structure and Function Cytoskeleton The cytoskeleton is a network of fibers that organizes structures and activities in the cell. Microtubules (the largest) Intermediate fibers Microfilaments
More informationClassification of Lipids
Classification of Lipids Neutral Lipids Amphipathic Lipids Amphipathic Lipids Most cell-membrane lipids are one of two main classes of amphipathic hydrolyzable lipids. Glycerophospholipids (phosphoglycerides):
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 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 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 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 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 informationCELLS and TRANSPORT Student Packet SUMMARY CELL MEMBRANES ARE SELECTIVELY PERMEABLE DUE TO THEIR STRUCTURE Hydrophilic head
CELLS and TRANSPORT Student Packet SUMMARY CELL MEMBRANES ARE SELECTIVELY PERMEABLE DUE TO THEIR STRUCTURE Hydrophilic head Hydrophobic tail Hydrophobic regions of protein Hydrophilic regions of protein
More informationPeroxisomes. Endomembrane System. Vacuoles 9/25/15
Contains enzymes in a membranous sac that produce H 2 O 2 Help survive environmental toxins including alcohol Help the cell use oxygen to break down fatty acids Peroxisomes Endo System Components of the
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 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 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 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 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 informationBoundary Lipid bilayer Selectively Permeable Fluid mosaic of lipids and proteins Contains embedded proteins
1 Boundary Lipid bilayer Selectively Permeable Fluid mosaic of lipids and proteins Contains embedded proteins 2 Phosphate head hydrophilic Fatty acid tails hydrophobic Amphipathic Phosphate attracted to
More informationTransport Movement across the Cell Membrane
Transport Movement across the Cell Membrane Lipids of cell membrane Membrane consists primarily of phosphos phospho bilayer inside cell phosphate hydrophilic outside cell hydrophobic S1 The Fluidity of
More informationChapter 9 - Biological Membranes. Membranes form a semi-permeable boundary between a cell and its environment.
Chapter 9 - Biological Membranes www.gsbs.utmb.edu/ microbook/ch037.htmmycoplasma Membranes form a semi-permeable boundary between a cell and its environment. Membranes also permit subcellular organization
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 informationCellular membranes are fluid mosaics of lipids and proteins.
Study Guide e Plasma Membrane You should be able to write out the definitions to each of the following terms in your own words: plasma membrane fluid mosaic integral proteins peripheral proteins receptor
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 informationIntroduction. Biochemistry: It is the chemistry of living things (matters).
Introduction Biochemistry: It is the chemistry of living things (matters). Biochemistry provides fundamental understanding of the molecular basis for the function and malfunction of living things. Biochemistry
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 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 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 informationStructure & Function of Cells
Anatomy & Physiology 101-805 Unit 4 Structure & Function of Cells Paul Anderson 2011 Anatomy of a Generalised Cell Attached or bound ribosomes Cilia Cytosol Centriole Mitochondrion Rough endoplasmic reticulum
More informationThe Cell Membrane (Ch. 7)
The Cell Membrane (Ch. 7) Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer Phosphate attracted to water Fatty acid repelled by water Aaaah, one of those structure
More informationChapter 1 Plasma membranes
1 of 5 TEXTBOOK ANSWERS Chapter 1 Plasma membranes Recap 1.1 1 The plasma membrane: keeps internal contents of the cell confined to one area keeps out foreign molecules that damage or destroy the cell
More informationCh. 7 Cell Membrane BIOL 222
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
More informationI. Fluid Mosaic Model A. Biological membranes are lipid bilayers with associated proteins
Lecture 6: Membranes and Cell Transport Biological Membranes I. Fluid Mosaic Model A. Biological membranes are lipid bilayers with associated proteins 1. Characteristics a. Phospholipids form bilayers
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 informationTransport through membranes
Transport through membranes Membrane transport refers to solute and solvent transfer across both cell membranes, epithelial and capillary membranes. Biological membranes are composed of phospholipids stabilised
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 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 information3.2.3 Transport across cell membranes
alevelbiology.co.uk 3.2.3 Transport across cell membranes SPECIFICATION The basic structure of all cell membranes, including cell-surface membranes and the membranes around the cell organelles of eukaryotes,
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 information