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Transcript 
The Cell is the Basic Unit of All
Living Things
All Living Organisms are
Composed of One or More Cells
All Cells Come From Pre-existing
Cells
All Cells Contain a Membrane,
Cytoplasm…
… and the Same Basic
Organic Compounds
•Proteins
•Lipids
•Nucleic acids
•Carbohydrates
Elements
•Carbon
•Hydrogen
•Oxygen
•Nitrogen
•Phosphorous
•Sulfur
Technically, Not a
Living Thing
Viruses Do Not…
•Reproduce
No Membrane &
Cytoplasm
Consist of Protein &
Nucleic Acid (DNA)
•Convert Energy
•Consist of Cells
Simplest Cells
Very Small
> 5 mm
Does not Have a
Nucleus
DNA Floats in
Cytoplasm
No membrane
Bound Organelles
Contains
Ribosomes
Only form Unicellular Organisms
Includes All Forms of Bacteria
Complex Cells
Relatively Large
(> 5 mm)
Has a Nucleus
Nucleus Holds
Cell’s DNA
Contains Organelles
Come in Various
Shapes & Sizes
Forms Both Unicellular & Multicellular Organisms
Includes All Protists, Fungi, Plants & Animals
Eukaryotic Cells
 Membrane
 Nucleus
 Organelles
 Large &
Complex
 Plants,
Animals,
Fungi, Protists
 > 5 mm
 Visible under
low power
Prokaryotic Cells
Membrane
No Nucleus
DNA free in
cytoplasm
Ribosomes only
structures
Small & Simple
Bacteria
1 – 5 mm
Visible under
high power only
Viruses
No membrane
Nucleic Acid
(DNA) & Protein
Cannot
reproduce on own
Cannot carry
out metabolism on
own
< 1 mm
Not visible with
our microscopes
1.0 mm
15.0 mm
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