Week 4 Cell- Unit of life

Week 4 Cell- Unit of life - Chapter 04 Cell Unit of Life...

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Cell: Unit of Life Chapter 04
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http://219.221.200.61/ywwy/zbsw(E)/edetail11.htm http://www.biology-online.org/dictionary/Main_Page
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Cell Structure Cell Structure and Function and Function 3 Outline Outline Prokaryotic Cells Prokaryotic Cells Eukaryotic Cells: Organelles Eukaryotic Cells: Organelles The Cell Cycle The Cell Cycle Mitosis Mitosis Reduction in Chromosome Number Reduction in Chromosome Number Meiosis Overview Meiosis Overview Homologous Pairs Homologous Pairs Meiosis Compared to Mitosis Meiosis Compared to Mitosis The Cell Cycle & Cancer
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4 Organisms and Cells
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5 Sizes of Living Things
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Types of Cells Prokaryotes Pro = before; karyon = nucleus relatively small - 5 to 10 um lack membrane-bound organelles earliest cell type Archaea Originally thought to be prokaryotes relatively small - 5 to 10 um lack membrane-bound organelles Usually live in extreme environments (thermophiles, halophiles, etc) Eukaryotes Eu = true; karyon = nucleus contain membrane-bound organelles Evolved from prokaryotes by endosymbioti c association of two or more prokaryotes Include
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Cell Structure Cell Structure and Function and Function 7 Prokaryotic Cells: Prokaryotic Cells: Domains Domains Lack a membrane Lack a membrane - - bound nucleus bound nucleus Structurally simple Structurally simple Two domains: Two domains: Bacteria Bacteria - Three Shapes Three Shapes w Bacillus Bacillus (rod) (rod) w Coccus Coccus (spherical) (spherical) w Spirilla Spirilla (spiral) (spiral) Archaea Archaea - Live in extreme habitats Live in extreme habitats
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Features of Prokaryotic Cells Capsule - outer sticky protective layer Cell Wall - rigid structure which helps the bacterium maintain its shape this is in NO way the same as the cell wall of a plant cell Plasma membrane - separates the cell from the environment Mesosome- infolding of plasma membrane to aid in compartmentalization Nucleoid- region where nakedDNA is found Cytoplasm: - semi-fluid cell interior - no membrane-bound organelles - location for metabolic enzymes - location of ribosomes for protein synthesis
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9 Shapes of Bacterial Cells
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10 Prokaryotic Cells: Visual Summary
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11 Hypothesized Origin of Eukaryotic Cells
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Eukaryotic cell
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Nucleus : The nucleus is the most obvious organelle in any eukaryotic cell. It is enclosed in a double membrane and communicates with the surrounding cytosol via numerous nuclear pores. Within the nucleus is the DNA responsible for providing the cell with its unique characteristics. The DNA is similar in every cell of the body, but depending on the specific
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Week 4 Cell- Unit of life - Chapter 04 Cell Unit of Life...

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