<p>Comparing Plant, Animal, and Bacteria Cells </p><p>Problem: How are plant, animal, and bateria cells alike? How are they different?</p><p>Procedure: In this lab, you will view cells from your cheek (animal cells), cells from an onion, which is a plant, and bacteria cells found in yogurt. Careful observation should reveal similarities and differences between the cells. Cheek Cells</p><p>Gently scrape a toothpick over the inside of your cheek and swirl it in a drop of methylene blue to stain the cells (otherwise they will be clear and difficult to see). You are looking for light colored blobs with dark spots in them. Perfect circles with black outlines are airbubbles. Don't sketch those. Sketch the cheek cells under low and high power. Make sure you are drawing your cells to SCALE - that is, the size of your drawing should reflect the size that you view them in the microscope.</p><p>Low Power High Power 1. Identify the NUCLEUS on your drawing.</p><p>2. Identify the CELL MEMBRANE on your drawing. </p><p>3. Identify the CYTOPLASM (area) on your drawing. </p><p>Elodea Cells</p><p>Cut a small peice of elodea leaf and prepare a wet mount. When you are looking for cells, you should find a lot more than you found with the cheek cells, and it will resemble a green brick wall. Sketch your cells under low and high power, also paying attention to scale. The nucleus of these cells will not be visible but you should see many chloroplasts within each cell. Plant cells also have a rigid cell wall, outside the cell membrane. The Cell wall should also be visible.</p><p>Low Power High Power 1. Identify the CHLOROPLASTS on your drawing.</p><p>2. Identify the CELL WALL on your drawing. </p><p>3. Identify the CYTOPLASM (area) on your drawing. </p><p>4. Identify the CENTRAL VACUOLE on your drawing.</p><p>Analysis - Venn Diagram</p><p>Create a Venn Diagram of plant and animal cells. Remember, things that they have in common go into the overlapping area, things that are different go in the non-overlapping area.</p><p>Bacteria Cells Prepare a wet-mount slide by using a toothpick to mix a tiny dab of yogurt with a drop of water and then adding a coverslip. The mixture should have clear areas; it should not be entirely opaque. Observe under progressively higher magnification to locate the bacteria, which will be floating in between the areas of coagulated protein and other milk solids. Sketch your cells under low and high power, also paying attention to scale. </p><p>Low Power High Power </p><p>Analysis - Venn Diagram</p><p>Create a Venn Diagram of eukaryotic and prokaryotic cells. Remember, things that they have in common go into the overlapping area, things that are different go in the non- overlapping area.</p>