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Virtual Lab – Diffusion Across a Selective Permeable Membrane Diffusion is a passive process that moves substances from an area of [word1] concentration to an area of [word2] concentration.

Dialysis tubing is a selectively permeable membrane made with the macromolecule, cellulose. Starch, glucose, water and the IKI reagent arecontained within the dialysis membrane in solution B shown below. Solution A in the beaker, at the start of the experiment in panel (a) contains just water. Diffusion of these molecules occurs, over time, from panels (a)-(c). The only selective criterion for diffusion across a dialysis membrane is the size of the molecule. Which of these molecules will diffuse the fastest? 

Virtual Lab – Microscopy – Wet Mount (Euglena) What organelle assists the Euglena in osmoregulation?

Virtual Lab – Osmosis – Tonicity in Red Blood Cells (Animal Cells) Which osmotic conditions will result in cloudy blood solutions? Why?

Virtual Lab – Microscopy – Wet Mount (Euglena) Here are the four steps to creating a wet mount, listed in proper order: Place a Small Drop of Liquid Apply the Cover Slip Adjust and Examine Position the Specimen

Virtual Lab – Operation of Bright Field Microscope How do you bring a specimen into focus quickly?

Virtual Lab – Microscopy – Wet Mount (Euglena) In a wet mount preparation: The glass piece that forms the base is called the cover slip. The glass that covers the top of the specimen is called the slide.

Virtual Lab – Osmosis – Tonicity in Red Blood Cells (Animal Cells) One major structural difference between animal cells and plant cells is that plant cells have a rigid cell wall made of cellulose.

Virtual Lab – Operation of Bright Field Microscope The field of view (FOV) refers to the extent of the observable area that is visible through a microscope. It is the radius of the area you can see when you look through the lens or viewfinder.

Virtual Lab – Osmosis – Tonicity in Red Blood Cells (Animal Cells) In an isotonic environment blood cells maintain their normal, biconcave disc shape. This is due to the loss of water from the cells into the surrounding solution, causing the cells to become smaller and more irregular in shape. In a hypertonic environment blood cells undergo crenation, where they appear shrunken and spiky. There is no net movement of water into or out of the cells, so they retain their usual structure.