Chapter 1 Cells

1. Chapter 1Cells Section Reviews and Chapter Review

2. 1.3 1.) Use each of the following terms in a separate sentence: tissue, organ, function. • A tissue is a collection of similar cells that work together to perform a specific job. • An organ is a collection of different tissues that work together to perform a specific job. • The function of a part of an organism is what it actually does (it’s job)

3. 1.3 2.) What are the four levels of organization in living things? • A. Cell, multicellular, organ, organ system • B. Single cell, multicellular, tissue, organ • C. Larger size, longer life, specialized cells, organs • D. Cell, tissue, organ, organ system, organism

4. 1.3 3.) MATH SKILLS: One multicellular organism is a cube. Each of its sides is 3cm long. Each of its cells is 1cm3. How many cells does it have? If each side doubles it’s length, how many cells does it have now? • If each side is 3 cm and one cell is 1 cm3, then there are… • 3 x 3 x 3 = 27 cells in the organism • If the cell size doubles to 6 cm and each cell is still 1 cm3, then there are… • 6 x 6 x 6 = 216 cells in the organism

5. 1.3 4.) Applying Concepts: Explain the relationship between structure and function. Use alveoli as an example. Be sure to include more than one level of organization. • The structure of the alveoli as a web of blood vessels surrounding an air sac allows blood cells take in oxygen and bring it into the lungs (organ)

6. 1.3 5.) Making Inferences: Why can multicellular organisms be more complex than unicellular organisms? Use the three advantages of being multicellular in your answer. • Multicellular organisms can be more complex because they can specialize their cells. This means that they can develop adaptations for defense. • Being multicellular also means you can be larger and less things can eat you! • Finally, being multicellular means that you have a longer life because you have many cells. The loss of one cell kills a unicellular organism after all!