ANATOMY & PHYSIOLOGY I WORKSHEET I Plasma Membrane and Cellular Transport Structure of the Plasma Membrane 1. Why do you think it is important to have a membrane surrounding each of our trillions of cells? Expect varying answers‚ but the idea is have the students understand the plasma membrane separates the cells from their environment and each other while also regulating the material within each cell. 2. What are two distinctive physical features of phospholipids? Heads are polar (water soluble
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Chapter 7: Membrane Structure and Function 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. Name them. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe this model and then cite two lines of evidence that were inconsistent with it. 4. Who proposed the fluid mosaic model of membrane structure
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In this lab we will look at how molecules move across the membrane of a cell . Osmosis is the movement of water across a cell membrane.In osmosis the cell membrane is selectively permeable‚which allows for the membrane to control what types of substances that passes through.Transportation can either be passive or active.Passive transport does not require the use of added energy where as active transport requires the cell to use energy. Diffusion is the simplest form of passive transport. Using
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What materials need to be exchanged across a cell membrane? Water‚ nutrients‚ waste‚ gasses (O2/CO2)‚ amino acids (to build proteins)‚ sugars (carbos)‚ lipids‚ nucleic acids. 2.) In what way is an organism a protected compartment? Organisms have many layers of cells and material (such as skin) that protect them from the environment. The also arare selectively permeable in determining what they eat. 3.) What is the significance of a membranes being selectively permeable? It allows the cells to
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of a cell. Underneath the hard shell is a thin membrane that is just like the cell membranes in your cells. There are microscopic pores in the membrane that allow substances to move in and out of the cell. Way Cool! Recall that the function of the cell membrane is to control the internal balance of the cell. It helps to maintain homeostasis. In this lab you will use vinegar‚ an acid‚ to dissolve the shell off of the egg to expose the membrane. When you place the egg in water you will be
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are they located? Chapter Five: Cell Membranes and Signaling 1. Discuss the composition of the cell membrane‚ and how membrane molecules may differ among organisms‚ within an organism‚ and even within a cell. 2. What factors affect membrane fluidity‚ and how? Why is the cell membrane referred to as a “fluid matrix”? 3. Describe the properties of peripheral and integral membrane proteins and discuss membrane protein movement within the membrane. 4. What are recognition sites‚ and
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Cell Transport Mechanisms Essay There are two methods of moving molecules across the cell membrane‚ passive transport and active transport. Passive transport doesn’t use energy‚ while active transport does use energy. Passive transport allows molecules to move on their own according to natural laws of physics. The three types of passive transport mechanisms include diffusion‚ osmosis‚ and facilitated diffusion. Diffusion is the movement of materials from an area of most concentrated to
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Chapter 4: Membrane Structure and Function Fluid Mosaic Model 1. Consistency of membrane is solid enough to form a boundary‚ but flexible and permeable like a fluid. 2. Proteins scattered throughout - Embedded or on the surface - Can move around laterally 3. Phospholipid from bilayer‚ make up most of membrane 4. Glycolipids have carbohydrate chains attached. 5. Hydrophilic heads point out/into the cell 6. Hydrophobic tails point out towards each other Proteins 1. Glycoproteins: have
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Definition integral membrane protein Term If the direction of the net flux of an ion is against its electrochemical gradient‚ then that transport is passive. Definition False Term Of the gradients listed below‚ which is the most accurate description of the force that ultimately determines the movement of ions across the membrane? Definition Electrochemical gradient Term Which of the following pairs of characteristics is more likely to make a substance diffuse through the cell membrane? Definition
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Active and passive transport are the ways in which cells allow things to move into and out of the cell through the cell membrane. They include many different ways to transport things. Passive transport requires no expenditure of energy by the cell. However‚ Active transport requires ATPs which have energy in order for it to move something through the cell membrane. There are different types of transport to suit the sizes of molecules as well. Passive transport includes diffusion‚ osmosis‚ and
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