• Unit 4: Cells and Cell Membranes

    Cells are the smallest unit of life. This unit will help you to understand the characteristics, components, and functions of a cell. By learning the structures of the cells, you can see the similarities and differences between organisms. Bacteria, plant, animal, and fungus cells are similar in many ways and contain many of the same small structures known as organelles. However, there are characteristics that can help you distinguish whether a cell belongs to an animal, plant, fungus, or bacteria. For example, all plant cells contain cell walls, while animal cells lack this particular organelle. It is the water within a cell pressing against the cell wall that gives a plant its rigidity and your celery its crunch!

    Completing this unit should take you approximately 10 hours.