Why do most kitchens have a junk drawer? • Junk drawers hold miscellaneous items that don’t quite belong anywhere else. Scientists discovered a group of species that didn’t quite belong to the kingdoms of life… Species that are eukaryotic, but not plant, animal, or fungus?
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Why do most kitchens have a junk drawer? Junk drawers hold miscellaneous items that don’t quite belong anywhere else. Scientists discovered a group of.
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Why do most kitchens have a junk drawer?
• Junk drawers hold miscellaneous items that don’t quite belong anywhere else.
Scientists discovered a group of species that didn’t quite belong to
the kingdoms of life…
Species that are eukaryotic, but not plant, animal, or fungus?
Kingdom Protista
Protists
• Kingdom Protista is the “junk drawer” kingdom…– Eukaryotic species are
classified as protists when they don’t belong anywhere else.
Protists are a very diverse group of organisms containing over
200,000 species.
What are protists?
• All protists are eukaryotes:– Have a nucleus– Contain membrane-bound
organelles
Any eukaryote that doesn’t fit as a plant, animal, or fungus is characterized as a protist.
Protist Classification
• Protists can be classified into 3 categories:
Heterotrophs: Animal-Like Protists
Autotrophs: Plant-Like Protists
Decomposers & Parasites:
Fungus-Like Protists
Animal-Like Protists - Protozoa
• Means “first animals”• All unicellular• Classified by movement-type
Giardia lamblia
Protozoa
1. Zooflagellates – use flagella to move• A tail that whips back & forth
Protozoa
2. Sarcodines – use pseudopods to move• Pseudopods are an extension of cytoplasm
Protozoa
3. Ciliates – use cilia to move• Like small hairs
Protozoa
4. Sporozoans – do not move on their own• Parasitic to animals
Malaria is caused by the sporozoan Plasmodium.
Plant-Like Protists - Algae
• Protists that contain chlorophyll & other pigments for photosynthesis
• Can be multicellular or unicellular
Multicellular Algae
• Include seaweeds & kelp• 3 types of multicellular algae:
– Red Algae– Brown Algae– Green Algae
Red Algae
• Contain green & red pigments • Role/Function:
– Deeper sea, great at harvesting light– Help form coral reefs– Some used in foods & to make agar
Brown Algae
• Contain green & brown pigments • Role/Function:
– Form large habitats in aquatic ecosystems– Used in some food
Green Algae
• Green pigments• Role/Function:
– Some form symbiotic relationships with other organisms (lichens).