Ch06 Key Concepts, Vocabulary-Cell Membrane

Ch06 Key Concepts, Vocabulary-Cell Membrane - Chapter 6:...

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Chapter 6: Cell Membranes OVERVIEW Chapter 6 examines the structure and functions of cell membranes. The chapter opens with a description of the fluid mosaic model and the lipid and protein classes that make up the membrane and account for its properties. Next is a discussion of the roles that membranes play in cell adhesion and intercellular signaling, including three types of cell junctions. After covering the key concepts of diffusion, Nernst potential, and osmosis, the ion channel and membrane transporter proteins are introduced, with emphasis on passive and active transport mechanisms. The chapter closes with discussions of vesicular transport mechanisms and several other membrane functions. KEY CONCEPTS 1. The fluid mosaic model of biological membranes consists of a phospholipid bilayer in which membrane proteins can move laterally within the plane of the membrane. 2. The two surfaces of a membrane may have different properties because of differences in phospholipid composition, the exposed domains of integral membrane proteins, and the associated peripheral membrane proteins. Defined regions of a plasma membrane may have different membrane proteins. 3. Membranes are dynamic, constantly forming, changing, and breaking down. 4. Carbohydrates, attached to protein or lipid anchors, project from the external surface of the plasma membrane and function as recognition signals for interactions between cells. 5. In an organism or tissue, cells recognize and bind to each other by means of
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Ch06 Key Concepts, Vocabulary-Cell Membrane - Chapter 6:...

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