Day 22 What organelles do plants have that animals don't have? chloroplasts, cell walls, and central vacuoles What organelles do animals have that plants don't have? lysosomes Why do plants have chloroplasts? they are needed for photosynthesis Why do animals have lysosomes? they are needed to digest the food they eat Daily Warm-Up Exercises 1

Visualization Exercise 4.1 Color Visualization Exercise 4.1

Human Cheek Cells Human Cheek Cell Human Cheek Cell Procedure: Explain: “Human cheek cells are clear; they are very hard to see. The captions of these two images highlight this important information. ” Explain: “The methylene blue dye was added for this reason. Think about when we used the Congo red dye with the brine shrimp and the paramecia.” Ask: “Why do you think we used blue dye this time? Explain: “Different dyes are good for different things. Scientists use different types and colors of dye to highlight different structures and types of cells.” >>>end of exercise<<< The internal structure of these unstained cells is difficult to see. 400x The nuclei are visible in these stained cells. 400x