Download Life is Cellular

Life is Cellular
Cell Theory
1) All living things are composed of cells.
2) Cells are the basic units of structure
and function in living things
3) New cells are produced from existing
cells
Transmission Electron Microscopes

Provide cross-section (slice) image of
cells
Scanning Electron Microscopes
- Provide three dimensional images of
cells
All Cells have:
1) Cell Membranes
2) Genetic Information (DNA)
Eukaryotic Cells



contain DNA in a nucleus (at some time in
there life cycle)
generally larger and more complex than
prokaryotic cells
many are highly specialized
example: neurons
Eukaryotic Cells continued…
contain many structures and internal
membranes → eukaryotic organelles
 Make up a great variety of organisms
Examples: Plants, Animals, Fungi,
Protists

Prokaryotic Cells
do not contain nuclei (they do have
DNA)
 generally smaller and simpler than
eukaryotic cells
Example: Bacteria

Prokaryotic or Eukaryotic?