1. What did Hooke and Leeuwenhoek discover about cells by using a microscope?

2. What does the cell theory state? Name the three scientists mainly responsible for developing the cell theory.

3. List the four parts that are found in all living cells.

4. Describe the composition of the plasma membrane.

5. List functions of the cytoplasm and cytoskeleton.

6. What is the role of the nucleus of a eukaryotic cell?

7. List three structures that are found in plant cells but not in animal cells.

8. Outline the levels of organization of cells in living things, starting with the simplest level, that of single-celled organisms.