Texas Education Agency
Texas Gateway: Molecular Transport Phenomena: Diffusion, Osmosis, & Related Proc
By the end of this section, you will be able to define diffusion, osmosis, dialysis, and active transport and to calculate diffusion rates.
CK-12 Foundation
Ck 12: Osmosis
[Free Registration/Login may be required to access all resource tools.] Tutorial defines osmosis and the difference between osmosis and diffusion. Students will learn how to distinguish solute from solvent and solution and the hypotonic,...
Khan Academy
Khan Academy: Osmosis and Tonicity
Provides an overview of osmosis and tonicity and looks at how osmosis works, as well as the role it plays in the water balance of cells. Describes hypertonic, isotonic, and hypotonic solutions and their effect on cells.
CK-12 Foundation
Ck 12: Life Science: Diffusion
[Free Registration/Login may be required to access all resource tools.] The process of molecules moving from an area where there are lots of molecules to an area where there are fewer molecules is known as diffusion. The diffusion of...
Science Struck
Science Struck: Osmosis vs. Diffusion: How Are They Different?
Explains the processes of osmosis and diffusion using labeled illustrations, discusses how they occur and gives examples.
Concord Consortium
Concord Consortium: Diffusion, Osmosis and Active Transport
This activity demonstrates diffusion, osmosis, and active transport through 12 interactive models. (Requires Java)
Bryn Mawr College
Serendip: Diffusion Across a Selectively Permeable Membrane
Brief text summary of what students learn in the Diffusion across a Selectively Permeable Membrane lab, along with links to download Student Handouts and Teacher Preparation Notes in PDF or Word formats. Main teaching points include...
CK-12 Foundation
Ck 12: Life Science: 2.10 Diffusion
Understand the processes of osmosis and diffusion.
CK-12 Foundation
Ck 12: Biology: Osmosis
[Free Registration/Login may be required to access all resource tools.] Describes osmosis.
City University of New York
The World of Cells: Osmosis
This definition and explanation osmosis shows how water diffuses from regions where it is in high concentration to regions where it is in low concentration.
City University of New York
Brooklyn College: Osmosis Interactive Activity
Great activity with clear background information. Try out the lab using osmosis to calculate molecular weight.
University of Hamburg
University of Hamburg: Membranes: Diffusion, Permeability, Osmosis, Turgor, Active and Passive Transport and Transport
This cellular biology page presents extensive detail on the chemical nature of the cell membrane. Using the Chime plug-in, students can manipulate and study models of the membrane.
Science Education Resource Center at Carleton College
Serc: Investigating Osmosis Using Water and Gummy Bears
In this biology classroom lab, students investigate the affect of soaking a Gummy Bear in water. They collect measurements of height, width, and mass before and after the soaking of the candy overnight. Students calculate % change for...
Other
Biology Simulations: Diffusion and Osmosis
This simulation can be used to study molecule movement across a semipermeable membrane.
Alabama Learning Exchange
Alex: Rubber Egg Diffusion
This lab will illustrate diffusion and osmosis through a semi-permeable membrane. A chicken egg will be used as the model cell, because the yolk is actually a single large cell. The surrounding egg white, or albumin, contains water and...
OpenStax
Open Stax: Anatomy and Physiology: Tubular Reabsorption
Lists specific transport mechanisms occurring in different parts of the nephron, including active transport, osmosis, facilitated diffusion, and passive electrochemical gradients.
Biology Pages
Kimball's Biology Pages: Transport Across Cell Membranes
This site has information on how facilitated diffusion of ions takes place through proteins, or assemblies of proteins, embedded in the plasma membrane. Includes a helpful diagram.
OpenStax
Open Stax: Physics: Molecular Transport Phenomena
Learn about diffusion, osmosis, dialysis, and active transport in this college textbook. Section also includes how to calculate the rate of diffusion. Section includes problems and questions for the students to answer to ensure...
BBC
Bbc: Gcse Bitesize: Supplying the Cell
For an organism to function, substances must move into and out of cells. Three processes contribute to this movement - diffusion, osmosis and active transport. Diffusion is the process by which useful materials and waste products move in...
BioMan Biology
Bio Man Biology: Cell Defense: The Plasma Membrane
Learn all about cell membranes in this game. Build a plasma membrane and learn about the membrane's functions. Identify the parts of a membrane, and learn how diffusion, transport, and osmosis work in cells. Includes a worksheet that can...
Carnegie Mellon University
Chem Collective: Osmotic Pressure
When a balloon is filled to near bursting with SF6 is left in air, it will often burst after a period of time. This is because the smaller N2 molecules diffuses into the balloon while the larger SF6 molecules remains causing the balloon...
TeachEngineering
Teach Engineering: Cell Membrane Structure and Function
Young scholars learn about the different structures that comprise cell membranes, fulfilling part of the Research and Revise stages of the legacy cycle. Students view online animations of cell membrane dynamics (links provided). Then...
Other
Biology Mad: Getting in and Out of Cells [Pdf]
This seven-page Biology course handout gives a detailed explanation, accompanied by many illustrations, of the various processes by which substances travel across the membranes of cells.
McGraw Hill
Glencoe Biology: Cellular Transport: Self Check Quiz
Answer five multiple-choice quiz questions about the different types of cellular transport.
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