CellTheoryMembranesOrganelles

CellTheoryMembranesOrganelles - Lecture 4...

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Lecture 4 Organelles Cell Diagram: College of Dupage
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Size of Living Things Diagrams: LargeDiagram : http://www.cellsalive.com/howbig.htm RelativeScale : Created by TimVickers, vectorized by Fvasconcellos 1 m = 100 cm = 1,000mm = 1,000,000 µm = 1,000,000,000nm 1mm = 1000 µm = 1000000nm 1 µm = 1000nm
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The Cellular Level of Organization Living things are constructed of cells . Living things may be unicellular or multicellular . Cell structure is diverse but all cells share common characteristics. Cells are small so they can exchange materials with their surroundings. Surface area relative to the volume decreases as size of cell increases. - limits the size of cells _____ ________ states: - All organisms are composed of one or more cells. - Cells are the basic unit of structure and function in organisms. - All cells come only from other cells.
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Signal Transduction To survive, an organism must constantly adjust its internal state to changes in the environment. Must be able to receive and transmit signals, communications to coordinate activities. These may be in the form of chemicals , such as hormones or nutrients , or may take another form, such as light , heat , or sound . This communication not simple, Signal sets off chain of events that may involve several or even dozens of steps. As the signal moves through these steps, it may be transduced , or changed in form. ________ _______________ refers to the entire set of pathways through which environmental signals are received and responded to by single cells. Especially important in multicellular organisms…must coordinate the activities of hundreds to trillions of cells. Examples: Skin growth, Cell division. Images: Cell, College of DuPage Signal Transduction, Audre Geras
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CYTOPLASM Nickname: The Matrix Function: "molecular chowder" in which the organelles are suspended Inside the plasma membrane, the nucleus is surrounded by cytoplasm. A water-like substance that fills cells. Consists of _________ and __________ ________ , except for the cell nucleus. Cytosol is made up of water, salts, organic molecules and many enzymes that catalyze reactions. Cell Diagram: College of DuPage
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CYTOSKELETON Nickname: Functions: Multiple Maintains cell _________ Protects the cell Enables some cell ________ (using structures such as flagella and cilia) Plays important roles in intra-cellular transport (the movement of vesicles and organelles) Plays important role in cellular ___________ Images: Cell, College of DuPage Fluorescent Cells NIH Pub Domain Cytoskeleton Diagram, Audesirk, Teresa and Gerald, Biology , Prentice Hall, 1999
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Microfilaments, Intermediate Filaments Network of protein fibers running throughout the cytoplasm Micro__________
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CellTheoryMembranesOrganelles - Lecture 4...

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