Lab 4 Microscope Usage, Cell Structure, Diffusion and Osmosis Complete your answers in the spaces provided. USE YOUR OWN WORDS – Yes even for definitions! Remember to add your last name and first initial to the file name prior to saving and submitting your completed assignment through Canvas. Cells have three ways to get things in or out: Diffusion, Osmosis, and Active Transport. In this lab you are going to become familiar with how microscopes work and in doing so explore the inner workings of individual cells. Pre-Lab Questions 1. Explain the concept of diffusion and provide an example. 2. Explain the concept of osmosis and provide an example. 3. Explain the concept of active transport and provide an example. 4. What is a concentration gradient? What role does a concentration gradient play in diffusion and osmosis? 5. Explain the concept of semi-permeable membrane. Provide an example of what can and cannot get through a plasma membrane.

Click here for the lab activity. Read the Objectives and Instructions then click on “Begin Assignment”. On the next page, click on “Click here to get a microscope” Read through and follow the directions to familiarize yourself with how to navigate the virtual microscope. The controls for zoom in, zoom out are located at the bottom of the microscope image. They are noted here with the big red arrow. I thought they were a little difficult to find at first so this just shows you where to look. On the website there is not a big red arrow.

Once you have figured out how to operate the microscope click on “Continue” found in the left frame. 6. How do you determine the total magnification? 7. Do you have to use the objective lenses in any specific order? If so, what is the order? …