Download Cell Theory and Viruses 7.1

7.1 Cell Discovery and Theory
What is The Cell Theory?
 All organisms are composed
of one or more cells.
 The cell is the basic unit of
structure and organization of
organisms.
 All cells come from
preexisting cells.
How are Light Microscopes Used?
 Utilizes a series of
glass lenses and
visible light to
magnify an image
 High Power 400 X
 Low Power 100X
How are Electron Microscopes Used?
 Utilizes magnets to aim a beam of electrons at
a cell to produce
an image
 Magnifies
images up to
500,000 times
the actual size
9560x
Microscopy Links http://biologygmh.com/
What is a Prokaryotic Cell?
 Simple structure
 Contains a plasma
membrane
 Does not contain
membrane-bound
organelles
BACTERIA
11,000x
What is a Eukaryotic Cell?
 More complex
structure
 Contains a plasma
membrane
 Contains membranebound organelles
 PLANTS AND
ANIMALS
400x
Are Viruses Alive?
• A nonliving strand of genetic
material within a protein coat
• No organelles to take in or use
energy, must use energy from
host cell
• Can not move
• Can not make proteins
• Can not replicate on their own
How are Prokaryotic Cells, Eukaryotic
Cells and Viruses Different?
Structure
Prokaryotic Cells
(Bacteria)
Eukaryotic Cells
(plant and animal)
Viruses
DNA
DNA floats in
cytoplasm in
enclosed loop
Membrane bound
nucleus w/ DNA
DNA surrounded by
protein coat
Membrane or Cell
Wall
Cell Membrane and
a cell wall
Cell membrane and
maybe a cell wall
No cell membrane or
a cell wall
Energy Production
In cell membrane No
mitochondria
In mitochondria
Gets energy from
host cell
Reproduction
Asexual or Sexual
Asexual or Sexual
Asexual only,
obligate intracellular
parasite
Chapter 7
Cellular Structure and Function
Vocabulary
Section 1
cell
cell theory
plasma membrane
prokaryotic cell
eukaryotic cell
organelle
nucleus