Download Chapter 7.1~ Life is Cellular

Chapter 7.1~ Life is Cellular
Pages 169-172
Important “Cellular” Scientists
Robert Hooke1665
Constructed one of
the first light
microscopes
Looked at dead
cork cells
Coined the term
“cell” because of
their appearance
Important “Cellular” Scientists
Anton van
Leeuwenhoek1674
Mastered technique
of creating lenses
Observed living
organisms with
improved light
microscope
Important “Cellular” Scientists
Matthias Schleiden- 1838
Concludes all plants are made of cells
Theodor Schwann- 1839
Concludes all animals are made of cells
Rudolph Virchow- 1855
Proposes all cells come from preexisting cells
Cell Theory
Schledien, Schwann, and Virchow’s
observations laid the foundations for
the cell theory.
The Cell Theory states:
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.
Important “Cellular” Scientists
Janet Plowe- 1931
Demonstrates the cell
membrane is a physical
structure
Helps develop
understanding of cell
structures
Lynn Margulis- 1970
Proposes theory of
endosymbiosis
Helps develop
understanding of cell
structures
Basic Cell Structures
Cell MembraneThin, flexible barrier
around cell
Separates the
“outside” from the
“inside”
Cell WallThick, inflexible
barrier around cell
Surrounds the Cell
Membrane
Basic Cell Structures
CytosolLiquid material
inside cell
OrganelleSpecialized
structure within cell
CytoplasmCytosol plus
organelles
Basic Cell Structures
NucleusInternal structure containing cell’s genetic
material
Prokaryotic versus Eukaryotic
Pro“Before”
Eu“True”
-kary“Nucleus”
Prokaryotic =
Before Nucleus
Eukaryotic = True
Nucleus
Prokaryotic
Eukaryotic