1.3 Membrane structure
IB Syllabus Statements
Understandings:
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Phospholipids form bilayers in water due to the amphipathic properties of phospholipid molecules.
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Membrane proteins are diverse in terms of structure, position in the membrane and function.
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Cholesterol is a component of animal cell membranes.
Applications and skills:
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Application: Cholesterol in mammalian membranes reduces membrane fluidity and permeability to some solutes.
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Skill: Drawing of the fluid mosaic model.
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Skill: Analysis of evidence from electron microscopy that led to the proposal of the Davson-Danielli model.
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Skill: Analysis of the falsification of the Davson-Danielli model that led to the Singer-Nicolson model.
Video
The Plasma Membrane (Cell Membrane)
Drawing the fluid-mosaic model
Models of membrane structure
Amphipathic Properties of Phospholipids
Flashcards
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Topic 1.3 Membrane structure SSaQ (Syllabus Statement as Questions)
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Explain how the amphipathic properties of phospholipids help them to form bilayers in water.
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Outline different types of membrane proteins, including their structure, position in the membrane, and function.
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Outline the location and function of cholesterol in animal cell membranes.
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Draw a diagram of the fluid mosaic model of the plasma membrane. Use the following guidelines: phospholipids draw as a circle with two parallel lines, show a range of membrane proteins, including glycoproteins
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Explain the evidence from electron microscopy that led to the proposal of the Davson-Danielli model of the plasma membrane.
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Explain the falsification of the Davson-Danielli model that led to the acceptance of the Singer-Nicolson model of the plasma membrane.