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Levels of Organization
• Atom
• Molecule
• Organelles
• Cells
• Tissue
• Organ
• Organ System
• Organism
The Cell Theory – a timeline
• Late 1500’s: -first lenses used in Europe
-used to determine cloth
quality (weave and precision)
-combos of lenses gave better
view
• Early 1600’s: Leeuwenhoek uses
microscope to study nature
Early 1600’s
• Leeuwenhoek
• Used a hand made
microscope to look
at pond water
• First to see living
microscopic
organisms
• Made careful
sketches
Early 1600’s
Robert Hooke ( 1665)
• Used light
microscope to look
at thin slices of plant
tissues -- cork
• Looked empty, like
monk’s chamber
• Called tiny chambers
“cells”
Matthias Schleiden 1838
• German Botanist
(plants)
• All plants looked at
were made of cells,
so concluded:
“All plants are
made of
cells.”
Theodore Schwann -- 1839
• German scientist
who studied animals
-- zoologist
• Saw that all animals
he studied were
cellular so
concluded:
“All animals are
made of cells.”
Rudolf Virchow -- 1855
• German physician
who studied cell
reproduction
• “Where a
cell exists,
there must
have been a
preexisting
cell…..”
The Cell Theory
• All living things are composed of
cells
• Cells are the basic units of structure
and function in living things
• New cells are produced from existing
cells
Prokaryotes vs. Eukaryotes
• Prokaryotes: *NO NUCLEUS
*Small and Simple – few
organelles
*Have cell membranes
and cytoplasm
Ex. Bacteria
• Eukaryotes: *Contain nuclei
*Contains organelles that
perform specialized functions
*Uni-or multicellular
Prokaryotes vs. Eukaryotes
• Prokaryotes: *NO NUCLEUS
*Small and Simple – few
organelles
*Have cell membranes
and cytoplasm
Ex. Bacteria
• Eukaryotes: *Contain nuclei
*Contains organelles that
perform specialized functions
*Uni-or multicellular

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(10) the cell theory 12 13.pptx

  • 1. Levels of Organization • Atom • Molecule • Organelles • Cells • Tissue • Organ • Organ System • Organism
  • 2. The Cell Theory – a timeline • Late 1500’s: -first lenses used in Europe -used to determine cloth quality (weave and precision) -combos of lenses gave better view • Early 1600’s: Leeuwenhoek uses microscope to study nature
  • 3. Early 1600’s • Leeuwenhoek • Used a hand made microscope to look at pond water • First to see living microscopic organisms • Made careful sketches Early 1600’s
  • 4. Robert Hooke ( 1665) • Used light microscope to look at thin slices of plant tissues -- cork • Looked empty, like monk’s chamber • Called tiny chambers “cells”
  • 5. Matthias Schleiden 1838 • German Botanist (plants) • All plants looked at were made of cells, so concluded: “All plants are made of cells.”
  • 6. Theodore Schwann -- 1839 • German scientist who studied animals -- zoologist • Saw that all animals he studied were cellular so concluded: “All animals are made of cells.”
  • 7. Rudolf Virchow -- 1855 • German physician who studied cell reproduction • “Where a cell exists, there must have been a preexisting cell…..”
  • 8. The Cell Theory • All living things are composed of cells • Cells are the basic units of structure and function in living things • New cells are produced from existing cells
  • 9. Prokaryotes vs. Eukaryotes • Prokaryotes: *NO NUCLEUS *Small and Simple – few organelles *Have cell membranes and cytoplasm Ex. Bacteria • Eukaryotes: *Contain nuclei *Contains organelles that perform specialized functions *Uni-or multicellular
  • 10. Prokaryotes vs. Eukaryotes • Prokaryotes: *NO NUCLEUS *Small and Simple – few organelles *Have cell membranes and cytoplasm Ex. Bacteria • Eukaryotes: *Contain nuclei *Contains organelles that perform specialized functions *Uni-or multicellular