Botany Chapter 3

Botany Chapter 3 - Chapter 3: Cells Cell theory Developed...

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1 Chapter 3: Cells ± Developed around 1838 by Schleiden and Schwann ± Cells are the basic (smallest) living units of organization and function… building blocks ± All cells come from other cells (no spontaneous generation) ± Basic similarities in structure and makeup ± ± Cell theory Cells ± ± Most bacteria, some fungi ± ± Tissues ± Organs ± Most are very small ± Easier management
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2 ± Light microscope (compound microscope) ± 2 features determine clarity of object: ± ± ± 500 times more resolution than human eye ± Staining may allow for better observation ± Fluorescence microscope ± Good for chlorophyll ± Fluorescent dyes Microscopes ± Developed in the 1950s ± Allows study of the ultrastructure of cells ± 10,000 – 200,000 times more resolution than human eye ± Types of electron microscope ± Transmission electron microscope ± Scanning electron microscope Electron microscope (EM) Comparing light and electron microscopy
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3 Eukaryotic versus Prokaryotic Cells ± ± Cells lacking a nucleus ± No membrane-bound organelles ± ± Cells containing a nucleus ± Have membrane-bound organelles ± Organelles ± Membrane-bound bodies found within eukaryotic cells ± Specialized functions Cell Structure ± ± surrounds protoplasm (contains all living cell components) ± Found in plant cells ± ± Cytoplasm ± consist of all cellular components between the plasma membrane and the nucleus. ± Cytosol ± Fluid within cytoplasm containing organelles. ± Surface membrane/selective barrier surrounding all cells ± Made up of phospholipids ± Separates cell contents from the outside ± Allows for exchange of necessary materials ± Has pumps and gated channels (proteins)
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Botany Chapter 3 - Chapter 3: Cells Cell theory Developed...

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