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Levels of Organization CHAPTER 2 LESSON 2. Single-Celled Organisms  Prokaryotes:  Single celled organisms that do not have membrane bound organelles.

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Presentation on theme: "Levels of Organization CHAPTER 2 LESSON 2. Single-Celled Organisms  Prokaryotes:  Single celled organisms that do not have membrane bound organelles."— Presentation transcript:

1 Levels of Organization CHAPTER 2 LESSON 2

2 Single-Celled Organisms  Prokaryotes:  Single celled organisms that do not have membrane bound organelles.  Example: Bacteria.  Bacteria have structures with specific functions, but they do not have a nucleus or other organelles.  Eukaryotes:  More complex than bacteria. They have a nucleus and membrane bound organelles.

3 Multicellular Organisms  Multicellular organisms have many cells and usually have more than one type of cell.  They have more complex organization than single-celled organisms.

4 Humans are Multicellular organisms  You started as a single cell.  You grew by mitosis and cell division and now you are an organism with many types of cells.  Make a list with you partner on pg # 68 in your notebook of all of the different types of cells that you can think of.  Ex: Skin cells, brain cells, liver cells…etc…  Remember, there are over 500 in humans alone!  WHO CAN GET THE MOST?

5 How do we get so many different types of cells?  All cells in your body start out as stem cells.  Stem Cells are cells that can become different types of cells.  Stem cells become different types of cells through a process called cell differentiation.  Different cell types use different parts of the instructions on chromosomes (DNA).  Think of this like an actor learning lines for a play.  He only needs to memorize his lines, not the entire play!

6 Stem Cells  We still have stem cells in our bodies, and they are in the middle of some of your bones.  Stem Cells are undifferentiated cells, but under the right conditions, they can become many different types of cells!  Brainstorm with your partner:  How could stem cells be important for treating diseases?

7 Levels of Organization  One of the characteristics of life is organization.  Arrange the following from smallest to largest:  Organ  Organism  Tissue  Organ System

8 Levels of Organization  Tissues are groups of cells that work together to perform a function.  4 types of tissue: Muscle tissue, Nervous tissue, Connective tissue, Epithelial tissue.  An Organ is a group of similar tissues that work together to perform a function.  An Organ System is one or more organs that work together and perform one or more functions.  An Organism relies on organ systems.

9 Levels of Organization  Without these levels of organization, your body would be a jumble !


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