Single-Celled
Organisms
Created By: K. Duong
http://www.ck12.org/teacher/
R 31
Living Things are Composed of Cells
• Single Cell
– Organisms have everything they need to be selfsufficient
• Multi-Cellular
– Organisms, specialization increases until some
cells do only certain things
http://infohost.nmt.edu/~klathrop/7characterisitcs_of_life.htm
Single-Cell Organisms
http://scienceblogs.com/clock/2007/01/25/current-biological-diversity/
Multi-Cellular Organisms
http://www.learner.org/courses/essential/life/session1/closer1.html
Two basic types of cells
•Prokaryotic cells
•No nucleus
•DNA in cytoplasm
•Eukaryotic cells
•Has a nucleus
•DNA inside nucleus
Single Celled Organisms
• Protists: are eukaryotes, cannot be classified
as animals, plants, or fungi
3 Subgroups:
– Animal-like
– Plant-like
– Fungus-like
Single cell with several flagella (animal-like)
Giardia
Fungus-like
Protists
Type
How They
Move
Special
Features
Euglena
Flagella: tail-like structure
Unique feature: eye spot
Some contain chlorophyll
Amoeba
Cytoplasmic streaming: directed
flow of the liquid inside cells
Surrounds and engulfs food
Cilia: hair-like structures
Most complex & specialized
Flagella: tail-like structure
Some contain Chlorophyll and
perform photosynthesis
Paramecium
Volvox
(pseudopods: “false feet”)
Cilia and Flagella Video:
http://youtu.be/QGAm6hMysTA
Paramecium
Euglena
Cytoplasmic Streaming:
http://youtu.be/pvOz4V699gk
Amoeba engulfing 2 paramecium
Volvox: http://youtu.be/d8xs8F9gln0
Additional Resources:
http://www.harcourtschool.com/activity/science_up_close/602/deploy/interface.html