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Its a Cellular World Unit 2: Cells Chapter 7: Cell Structure and Function Section 7-1 Life is Cellular Text- pages -169-173.

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Presentation on theme: "Its a Cellular World Unit 2: Cells Chapter 7: Cell Structure and Function Section 7-1 Life is Cellular Text- pages -169-173."— Presentation transcript:

1 Its a Cellular World Unit 2: Cells Chapter 7: Cell Structure and Function Section 7-1 Life is Cellular Text- pages

2 Vocabulary Cell Cell theory NucleusEukaryoteProkaryote

3 Objectives SWBAT explain how microscopes came into use and the early observations that were made by scientists. SWBAT explain how microscopes came into use and the early observations that were made by scientists. SWBAT describe the three steps of the Cell Theory. SWBAT describe the three steps of the Cell Theory. SWBAT describe some modern microscope techniques used to look at cells and their parts. SWBAT describe some modern microscope techniques used to look at cells and their parts. SWBAT explain how cells are classified. SWBAT explain how cells are classified. SWBAT describe the differences between prokaryotes and eukaryotes. SWBAT describe the differences between prokaryotes and eukaryotes.

4 Discovering the Cell Mid 1600s: scientists began to use microscopes to observe living things. Mid 1600s: scientists began to use microscopes to observe living things. 1665: Robert Hooke (England) compound scope 1665: Robert Hooke (England) compound scope 1674: Anton van Leeuwenhoek (Holland) single lens scope. 1674: Anton van Leeuwenhoek (Holland) single lens scope.

5 Cell Theory Cell Theory states… 1) All living things are composed of cells. 2) Cells are the basic unit of structure and function in living things. 3) New cells are produced from existing cells.

6 Exploring the Cell Today Todays researchers use microscopes and techniques that are much more powerful than those of early scientists. Todays researchers use microscopes and techniques that are much more powerful than those of early scientists. Examples: fluorescent labeling, light microscopes, 3-D imaging using electron microscopes Examples: fluorescent labeling, light microscopes, 3-D imaging using electron microscopes

7 Modern Techniques 3-D imaging 3-D imaging Fluorescent Labeling Fluorescent Labeling Light Microscopes Light Microscopes

8 Electron Microscopes SEM : Scanning Electron Microscope SEM : Scanning Electron Microscope –Scanning a pencil-like beam of electrons over the surface of an object. Produce a 3-d image TEM : Transmission Electron Microscope TEM : Transmission Electron Microscope –The transmission electron microscope (TEM) operates on the same basic principles as the light microscope but uses electrons instead of light.

9 TEM resource TEM resource –http://minerals.caltech.edu/Silica_Poly morphs/index.html morphs/index.htmlhttp://minerals.caltech.edu/Silica_Poly morphs/index.html –Pictures From The TEM Pictures From The TEMPictures From The TEM SEM resources SEM resources –scharfphoto.com: David Scharf: Home scharfphoto.com: David Scharf: Homescharfphoto.com: David Scharf: Home –Pictures From The SEM Pictures From The SEMPictures From The SEM

10 Classifying Cells Variety of shapes and sizes. Variety of shapes and sizes. Typical cell µm. Typical cell µm. 2 common characteristics: 2 common characteristics: 1)Surrounded by barrier- cell membrane 2)At some point in the cell lifespan they contain the molecule that carries biological information- DNA.

11 How small is a micrometer (um)? 1 micrometer (um) is one millionth of a meter 1/1,000,000 m 1 micrometer (um) is one millionth of a meter 1/1,000,000 m or 1 x or 1 x 10 -6

12 Cell Shapes

13 Classifying Cells contd 2 categories of cells- depend upon whether they contain a nucleus. 2 categories of cells- depend upon whether they contain a nucleus. –Eukaryotes: contain nuclei –Prokaryotes: no nucleus Nucleus: large membrane-enclosed structure that contains cells genetic material (nucleic acids) in the form of DNA. Nucleus: large membrane-enclosed structure that contains cells genetic material (nucleic acids) in the form of DNA. –Controls many of the cells activities.

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15 Prokaryotes Smaller and simpler than eukaryotes. Smaller and simpler than eukaryotes. No nucleus. No nucleus. Some contain organelles. Some contain organelles. Carry out every activity associated with living things. Carry out every activity associated with living things. –Grow, reproduce, respond to environment, glide, and swim –Example: Bacteria

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17 Eukaryotes Larger and more complex than prokaryotes. Larger and more complex than prokaryotes. Contain dozens of organelles. Contain dozens of organelles. Highly specialized Highly specialized Contain nucleus Contain nucleus Single celled or multi-cellular. Single celled or multi-cellular. Examples: plants, animals, fungi, and protists. Examples: plants, animals, fungi, and protists.

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21 Review Questions What are the 3 statements that make up the cell theory? What are the 3 statements that make up the cell theory? Whats the difference between prokaryotes and eukaryotes? Whats the difference between prokaryotes and eukaryotes? Do bacterial cells contain nuclei? Do bacterial cells contain nuclei?


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