1. Plant-like and Fungi-like Protists
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Plant-like Protists
Definition: Most are unicellular & photosynthetic organisms, some are multicellular, many are highly motile (get around)
Classification: Type of photosynthetic pigments
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3. Unicellular Plant-like Protists
Euglenophytes: Plant-like protist (can also live as heterotrophs), 2 flagella, no cell wall
Found in ponds & lakes
Eyespot to sense light
Reproduce by binary fission
Use contractile vacuole to expell water
Pellicle (cell membrane) is tough, flexible, but no cell wall
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Euglena
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Euglena
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2. Dinoflagellates
50% Photosynthetic, 50% Heterotrophic
Have 2 flagella
Luminescent
Have DNA, but it’s not tightly bound with histones
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Dinoflagellates
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Dinoflagellate
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Dinoflagellate
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Chrysophytes
Yellow-green & golden brown algae
Some contain pectin rather than cellulose
Store food as oil instead of starch
Reproduce asexually & sexually
Most are solitary, but some are colonial
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Diatoms
Walls are rich in silicon (found in glass)
May have a two-part structure
Don’t easily decompose (used in cleansers and toothpastes – think gritty feeling)
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Diatom
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Diatoms
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Multicellular Algae
Red algae
a. Phylum: Rhodophyta
b. Chlorophyll: Chlorophyll a & phycobilin (reddish pigment)
c. Habitat: Deep water, polar to tropics
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Red algae
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Red Algae
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Multicellular Algae
2. Brown Algae
a. Phylum: Phaeophyta
b. Chlorophyll: A & C, fucoxanthan
c. Habitat: most are marine, found in cool, shallow coastal waters of temperate or arctic areas
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Brown Algae
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Multicellular Algae
3. Green Algae
a. Phylum: Chlorophyta (cellulose cell walls, chlorophyll a & b, store food as starch) VERY MUCH LIKE PLANTS
b. Chlorophyll a & b
c. Habitat: fresh & saltwater, some areas on land, most are unicellular
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Green Algae
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Green Algae
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Human Uses for Algae
a. Produces oxygen, responsible for ½ of ALL photosynthesis on Earth
b. Used to make medicines, hi in vitamin C and iron
c. Used for foods such as ice cream, pancake syrup, eggnogs, and agar
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Fungi-like Protists
Definition:
Heterotrophs (absorb nutrients from dead or decaying organic matter), have centrioles, lack chitin in cell walls (chitin is found in TRUE fungi)
Examples:
Slime molds
Water molds
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Slime Molds
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25. Water Mold (White Patch)
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