1. What Is a Cell?

2. Activity 3: What Is a Cell? Get Started  What do cells look like?  What are cells made of?  What do cells do? Write or sketch your responses in your science notebook:

3. Activity 3: What Is a Cell? Introduction  With your group, write three analogies that describe cells in terms of common objects. Read the Introduction.

4. Activity 3: What Is a Cell?  What are the similarities and differences in cells from various living organisms? Challenge

5. Activity 3: What Is a Cell? Procedure  As you view the slides, think about the similarities and differences in the various types of cells.  Label your drawings carefully, including the magnification you are using.

6. Activity 3: What Is a Cell?

7.  Use what you have learned about cells to record the unique features of the cells of each group of organisms in the appropriate space. Record any common features between groups in the spaces created by overlaps. Analysis 4

8. Activity 3: What Is a Cell? Follow Up  Based on your observations, can you conclude for certain which cells do and do not have a nucleus?

9. Activity 3: What Is a Cell?  Based on the Venn diagram you created, what features are common to all cells? Analysis 5

10. Activity 3: What Is a Cell?  What are the similarities and differences in cells from various living organisms? Revisit the Challenge

11. Activity 3: What Is a Cell? Key Vocabulary  antibiotic  bacteria  cell  latent  macrophage  multicellular organism  protist  single-celled organism  tuberculosis Key Vocabulary