Membranes Stephen Taylor i-Biology.net Photo credit: Plasmolysis by MNolf via

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Presentation transcript:

Membranes Stephen Taylor i-Biology.net Photo credit: Plasmolysis by MNolf via

Pre-assessment What can you label on this diagram? Can you explain three different methods of transport across a membrane?

Plasma Membrane Label the diagram with components & functions Identify components that are involved in transport.

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Plasmolysis in Elodea and in onion cells. 1.Set up slides of Elodea cells and onion cells, with tap water medium. 2.Find cells under the microscope. Draw and label what you see. Include magnification. You might need to try different stains. 3.Draw salt solution through the slides. Observe and draw the effects. 4.Explain the effects of changing the salt concentration on the cells.

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Explain passive transport across membranes by simple diffusion & facilitated diffusion.

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Active transport uses energy, in the form of ATP, to move molecules across a selectively permeable membrane against the concentration gradient, using protein pumps.

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Annotate this diagram to explain vesicle transport & exocytosis. Animated tutorial:

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