006 20Cell 20Structure 20and 20Function1

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006 20Cell 20Structure 20and 20Function1 Powered By Docstoc
					The Cell as the Fundamental
 Unit of Life: The Structure
  and Function of Cellular
          Organelles
• The cell is the smallest unit of
  life.
• All organisms are composed one
  or more cells.
• New cells arise from previously
  existing cells.
     Basic Cell Structure
Each cell has four common components:
  1. Plasma membrane
  2. Region containing DNA
  3. Cytoplasm
  4. Biochemical molecules & biochemical
     pathways
                    Cells
Two fundamental types:
Prokaryotic
     No Nucleus
     No organelles
     Small 100nm-5um
Eukaryotic
    True Nucleus
    Membrane bound
    organelles
    10-100um
    Some are larger
                                 Classification

    Five kingdom system:
    Monera             Protista                             Plantae             Fungi       Animalia

    Six kingdom system:
  Eu-      Archae-         Protista                             Plantae         Fungi       Animalia
bacteria   bacteria


    Three domain system:
  Eu-      Archae-                           E              U      K        A    R      Y   A
bacteria   bacteria


    Eight kingdom system:
                                 Chromista
                      Archezoa




                                                 Protista




  Eu-      Archae-                                                Plantae         Fungi         Animalia
bacteria   bacteria
Three Lineages of Life: Domain Bacteria
         Kingdom Eubacteria
  Eu-      Archae-    Protista   Plantae   Fungi   Animalia
bacteria   bacteria




Prokaryotes:
     • No true nucleus
     • No membrane-bound organelles
Cell Wall composed of peptidoglycan
Reproduce asexually by budding and fission
Very small (1 - 10 µm)
                 Kingdom Archaebacteria
  Eu-      Archae-    Protista   Plantae   Fungi   Animalia
bacteria   bacteria




   Prokaryotes:
        No true nucleus
        No membrane-bound organelles like
             mitochondria or chloroplasts
   NO peptidoglycan in cell wall
   Reproduce asexually by budding and fission
   Very small (1 - 10 µm)
   “Extreme” environments (high temperatures)
Prokaryotic
   Cells
                           Eukaryotes
  Eu-      Archae-    Protista   Plantae   Fungi   Animalia
bacteria   bacteria




           Eukaryotes:
                True nucleus
                Membrane-bound organelles
           Cell size generally 10 - 100 µm
           At least 4 lineages:
           Protista, Plantae, Fungi, Animalia
Eukaryotic Cells



        Typical Animal
             Cell
   The
Cytoplasm
           Plasma Membrane
Fluid mosaic model:
   Working model of the membrane            Protein
   molecules bobbing in phospholipid sea Proteins
   determine membrane’s specific functions
Plasma Membrane
       Structure of the Cell Membrane

Phospholipids
  Most abundant lipid
  Polar/hydrophilic head(attracted to water)
  Pair of nonpolar/hydrophobic tails(repelled by water)
 Hydrophilic
 head

Hydrophobic
tails
Phospholipid bilayer:
    Polar heads, outside & inside
    Nonpolar tails in the interior
    Cell Membranes
The Nucleus
  The
Nucleus
The Endoplasmic
   Reticulum
            Rough and
            Smooth ER
Ribosomes
Mitochondrion
The Golgi Complex
Functioning of the Golgi
       Complex
Lysosome Function
Cytoskeleton
Cytoskeleton
Cillia & Flagella- 9x2 arrangement




                 0.1 micrometer
Flagellum
Flagellar
Movement
         Ciliated
        Epithelium

mucus               ciliated surface




                nuclei
Ciliary Movement
Ameboid Movement

 Ex. WBC
Typical Plant Cell
Typical Plant
    Cell
Cell Walls
Chloroplasts
                   INQUIRY
 1. Which kingdom do bacteria belong?
 2. What is the difference between prokaryotic and
    eukaryotic?
 3. Compare a plant and animal cell.
 4. What is the function of:
    • Mitochondria
    • Nucleus
    • Golgi apparatus
    • Lysozome
    • Ribosomes
    • Smooth and rough ER




Cellular Visions: The inner life of a cell (video)
http://www.studiodaily.com/main/searchlist/6850.html

				
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posted:11/10/2011
language:English
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