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Transcript
BLM 8-6, Types of Transport Across Cell Membranes/Reinforcement Goal: Students review their understanding of the various types of transport across cell membranes. Answers: A. Facilitated diffusion using carrier proteins: Facilitated diffusion works in the same direction as the concentration gradient. Carrier proteins recognize specific molecules because of their size and shape. The molecule to be carried fits into a groove in the protein, much like a lock and key. B. Diffusion (O2) and osmosis (H2O): Diffusion is the movement of particles from an area of high concentration to an area of low concentration. Osmosis is the diffusion of water molecules. C. Facilitated diffusion using channel proteins: Facilitated diffusion works in the same direction as the concentration gradient. Channel proteins fill tunnel-like pores in the membrane and recognize molecules by their electrical charge. D. Active transport: Active transport works against the concentration gradient and requires energy. BLM 8-7, The Role of Cell Membranes in Endocytosis and Exocytosis/Assessment Goal: Students review their understanding of endocytosis and exocytosis. Answers 1. A. Phagocytosis is a type of endocytosis. It is used to ingest food and other solids (“cell eating”). The cell membrane forms a pocket around the substance to be transported. B. Pinocytosis is also a type of endocytosis. This process is used to ingest fluids (cell “drinking”). The cell membrane forms a pocket around the substance to be transported. C. Exocytosis occurs to dispose of wastes or to secrete cell products outside of the cell. D. solid E. vesicle F. solute G. cell membrane H. secreted solute 2. Endocytosis is used when substances can’t be moved by either active or passive transport. 3. Receptor-mediated endocytosis is when membrane proteins act like receptors to recognize specific compounds or cells in the environment. When a receptor recognizes an item for transport, the receptor binds to it and triggers endocytosis.