Unit 4: The Cell Membrane
LT6: Describe how the structure of the cell membrane allows for it to regulate the flow of molecules in and out of the cell.
Computer Simulation Activity:
Concord Consortium: Diffusion, Osmosis and Active Transport
Concord Consortium: Diffusion, Osmosis and Active Transport
Lecture on Transport Across Membranes
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Diffusion and Osmosis
The first 4 minutes or so of this video has a detailed description of diffusion.
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This video gives another description of molecule movement during diffusion.
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Here's one on how osmosis works.
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This video shows how osmosis can be used to explain what we observed in the Gummy Bear lab.
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Here are several videos that show osmosis in actual cells. The first video is demonstrating osmosis in a red onion cell. The second video is demonstrating osmosis in an elodea leaf. The two pictures below the videos show white onion cells before and after adding iodine (a yellow staining liquid) to the slide.
Cell Membrane Structure
Here are a few other websites that can help you understand the structure and function of cell membranes.
This video summarizes cell membrane structure, and describes how different molecules can be moved across membranes.
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General Cell Structure and Function
Introduction to Cells: This online lab reviews some things about cells and microscopes that we have already learned in class. Here's the website for the virtual microscope:
http://www.udel.edu/biology/ketcham/microscope/
How do cells get nutrients inside? Here are some examples of how protists (single-celled organisms) feed:
Vorticella: https://www.youtube.com/watch?v=YHb2JaujIPo
Amoeba: https://www.youtube.com/watch?v=pvOz4V699gk
Paramecium: https://www.youtube.com/watch?v=fh_yjLppNAg
http://www.udel.edu/biology/ketcham/microscope/
How do cells get nutrients inside? Here are some examples of how protists (single-celled organisms) feed:
Vorticella: https://www.youtube.com/watch?v=YHb2JaujIPo
Amoeba: https://www.youtube.com/watch?v=pvOz4V699gk
Paramecium: https://www.youtube.com/watch?v=fh_yjLppNAg
The two videos below also give general introductions to cells.
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