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Learn how specific cell adaptations help unicellular organisms survive in different environments. Explore the diversity of bacteria and protists, including their structures and adaptive behaviors. Discover contractile vacuoles, cilia, flagella, pseudopods, eyespots, chemotaxis, and phototaxis. Watch a video on protist kingdom to enhance your knowledge.
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1.2.3 Explain how specific cell adaptations help cells survive in particular environments (focus on unicellular organisms).
Bacteria All unicellular All prokaryotic- no nucleus or membrane bound organelles Protists Unicellular; some multicellular ALL eukaryotic- have a nucleus and membrane bound organelles Bacteria vs. Protists
Diversity of Protist Kingdom • http://www.dnatube.com/video/5361/The-Protist--Protozoa-Algae-and-Funguslike-protists
Various Structures • Contractile vacuole- regulates osmosis so a cell does not gain to much water. • Found in many protists: amoeba, paramecia, euglena
Various Structures • Cilia- hair-like projections (some protists). • Flagella- tail-like projections (some bacteria and protists). • Both used for locomotion (movement).
Various Structures • Pseudopods- extensions of the cytoplasm used for movement and feeding (amoebas). • Eyespots- detect changes in light (dinoflagellates and euglena).
Adaptive Behaviors • Chemotaxis- movement towards or away from chemicals. • E. Coli swims towards amino acids and sugars. • Phototaxis- movement towards light. • Euglena and Cyanobacteria swims towards light to photosynthesize. • Seen in some bacteria and protists.