The different cell membrane transport mechanisms The cell membrane is referred to as a ‘fluid mosaic model’ because the protein part within the cell membrane used to be though of as an even layer spread over the outside and the inside of the phospholipid. Now we are starting to think that it is spread unevenly‚ more like a mosaic than a layer. The phospholipid part of the cell membrane is fluid; this means that its molecules are constantly moving about. Through the molecules constantly moving
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___________________ Classification of Body Membranes Purpose: What is the purpose of this exercise? Is there any safety concerns associated with this exercise? If so‚ list what they are and what precautions should be taken. The purpose of this exercise is to be able to classify the membranes and learn about each. In this lab I will observe each membrane. Basically just getting to know each membrane better. Exercise 1: The Microscopic Structure of Cutaneous Membranes Observations: Draw your sketch
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AP BIOLOGY CELL UNIT ACTIVITY #5 NAME_____________________ DATE___________HOUR_____ CELL TRANSPORT MEMBRANE PROPERTIES PASSIVE TRANSPORT CHARACTERISTICS: DIFFUSION: Cell Unit Activity #5 page 1 OSMOSIS : ISOTONIC ANIMAL CELLS Cell Unit Activity #5 page 2 HYPOTONIC HYPERTONIC PLANT CELLS OSMOREGULATION – ADAPTATIONS Paramecium Fresh Water Bony Fish FACILITATED D IFFUSION: Cell Unit Activity #5 page 3 Marine Bony Fish ACTIVE TRANSPORT CHARACTERISTICS:
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Kate Rowe Biology 4 10-8-09 Biology Essay: Parts of a Cell Describe the fluid-mosaic model of a plasma membrane. Discuss the role of the membrane in the movement of materials through each of the following processes: a.) Active Transport b.) Passive Transport All living cells contain a plasma membrane‚ which acts a boundary for the cell. The plasma membrane regulates the cell’s chemical composition because it uses selective permeability to allow certain substances to enter or exit the cell
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of beetroot cell membrane Introduction: Cell membranes contain many different types of molecules which have different roles in the overall structure of the membrane. Phospholipids form a bilayer‚ which is the basic structure of the membrane. Their non-polar tails form a barrier to most water soluble substances. Membrane proteins serves as channels for transport of metabolites‚ some act as enzymes or carriers‚ while some are receptors. Lastly carbohydrate molecules of the membrane are relatively
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substances across the cell membrane without the use of energy by the cell. During passive transport‚ substances move down their concentration gradient‚ hence no energy is required. Passive transports can happen through three different channels‚ namely 1. lipid bilayer 2. pore protein 3. carrier protein SIMPLE DIFFUSION What is diffusion? Diffusion is the movement of particles from a high density region to a low density region. No energy is needed and no membrane involves in diffusion
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a plasma membrane. Discuss the role of the membrane in the movement of materials through it by each of the following processes: a. Active transport b. Passive transport The plasma membrane is a semi permeable barrier that separates the inside of the cell from the outside environment. The plasma membrane is made up of carbohydrates‚ cholesterol‚ proteins‚ and a lipid bilayer‚ or double layer of lipids. The plasma membrane may be known as a fluid mosaic model where the membrane is a fluid
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BIOLOGY DB015 (ASSIGNMENT) PASSIVE AND ACTIVE TRANSPORT GROUP MEMBERS : ABDUL MUIN BIN ABDUL MALIK (MS1311580012) AIMAN HAKIM BIN A.MANAP (MS1311580006) MUHAMMAD AMIN BIN MAT SAUPI (MS MUHAMMAD FARIZUL BIN AMRAN (MS LECTURER : MISS AFIQAH BT MOHAMED Q INTRODUCTION The various organelles and structure within a cell require a variety of subtances in order to carry out their functions. In turn‚ they form products; some useful and some not. Most of these substances must pass in and
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Chapter 1 – Introduction to Biology List of PEKA experiments: Conducting an experiment to study the fitness level of students Making bread using yeast in the absence and the presence of sugar Number | Activity 1.1 (Experiment) | Pg. | 1 | Title | Conducting an experiment to study the fitness level of students | Aim / Objective of the Study | To study the fitness level of students / To determine cardiovascular fitness by measuring a person’s pulse rate before and after a given period of
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water through a cell membrane. 4. Define Turgor pressure ( also known as osmotic pressure). The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis‚ often used to express the concentration of the solution 5. What occurs when plasmolysis takes place? The cells shrink and shiver. 6. Define the terms endocytosis and exocytosis . * Endocytosis: the taking in of matter by a living cell by its membrane to form a vacuole
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