Download Cell: Smallest Unit of Life

1,000
Cell:
Smallest
Unit of
Life
Cancer
Cells
SEM
2,000
Eukaryotic (complex)
vs.
Prokaryotic (simple)
Cells
http://www.cellsalive.com/howbig.htm
How Life is Organized
Eukaryotic Cell Plan
How Life is Organized
Prokaryotic Cell Plan
Eukaryotic Cell Plan
Comparison of Cell Types
Prokaryotic cell
Colorized TEM 15,000 
Nucleoid
region
Nucleus
Note - Size,
scale, internal
organization of
each
Eukaryotic cell
Organelles
Scale of Life
Cells are limited in size because of
surface area to volume ratio
Too large a cell  too much volume
and not enough exchange with
environment
Smaller cells  less volume so easier
for cell membrane to meet metabolic
demand of the cell
Prokaryotic Cell Structure
Lacking well defined
nuclei or organelles
Variety of shapes and
sizes
Variety of Shapes and Sizes
Pneumonia
Strep Throat
Lyme’s Disease
Botchulism
Animal Cell
Compartmentalization of Eukaryotic
Cells
Many small enclosed
environments to
create environments
for unique chemical
reactions.
Note the continuous
flow of membranous
compartments
Endomembrane
system- internal
system of membrane
bound compartments
Plant Cell
Note the differences in
structure to animal
cell.
What are similarities?