Podcast
Questions and Answers
Which organism is characterized by having a double silica shell and is unicellular?
Which organism is characterized by having a double silica shell and is unicellular?
Which marine organism is known to produce red pigments and has two flagella?
Which marine organism is known to produce red pigments and has two flagella?
Which of the following organisms primarily exists in deep seawaters and is mostly multicellular?
Which of the following organisms primarily exists in deep seawaters and is mostly multicellular?
Which organism can be either unicellular or multicellular and is capable of forming colonies?
Which organism can be either unicellular or multicellular and is capable of forming colonies?
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What type of pigments does Ulva contain that contributes to its classification?
What type of pigments does Ulva contain that contributes to its classification?
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Study Notes
Protists
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Characteristics of Protists:
- Unicellular or multicellular
- Mostly aquatic
- Diverse groups, including algae, protozoa, and slime molds
- Some are autotrophic (photosynthetic), others are heterotrophic (consuming other organisms)
Algae
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Diatoms (Bacillariophyta):
- Unicellular
- Photosynthetic
- Silica cell walls (frustules)
- Important components of phytoplankton
-
Dinoflagellates (Dinophyta):
- Unicellular
- Photosynthetic
- Two flagella, one encircling the cell
- Some are bioluminescent
- Some produce toxins harmful to humans and marine life
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Diatoms (Bacillariophyta):
- Unicellular
- Photosynthetic
- Silica cell walls (frustules)
- Important components of phytoplankton
-
Euglenoids (Euglenophyta):
- Unicellular
- Some photosynthetic (chloroplasts), others heterotrophic
- Flagella
- Pellicle (protein strips) provides flexibility for cell shape
-
Red Algae (Rhodophyta):
- Mostly multicellular
- Photosynthetic (chlorophyll a and phycobilins - absorb red/blue wavelengths)
- Red pigment masks chlorophyll
- Most are marine
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Brown Algae (Phaeophyta):
- Multicellular
- Photosynthetic (chlorophyll a and c, fucoxanthin pigment)
- Occur in marine environments
- Kelps are large examples.
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Green Algae (Chlorophyta):
- Unicellular or multicellular
- Photosynthetic (chlorophyll a and b, same pigments as plants)
- Freshwater or marine
Fungi
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Characteristics of Fungi:
- Heterotrophic (absorb nutrients)
- Cell walls of chitin
- Wide variety in body plans (yeast, molds, mushrooms)
- Filamentous (hyphae) or unicellular (yeasts)
-
Myxomycota (Slime Molds):
- Heterotrophic
- Plasmodial phase (mass of cytoplasm)
- Spore-forming
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Oomycota (Water Molds):
- Heterotrophic
- Filamentous
- Reproduce sexually and asexually.
- Some are plant pathogens.
-
Acrasiomycota (Cellular Slime Molds):
- Heterotrophic
- Aggregative
- Can form multicellular slugs
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Description
Explore the fascinating world of protists and algae through this quiz. Learn about their unique characteristics, classifications, and ecological importance. From diatoms to dinoflagellates, discover how these organisms contribute to aquatic environments.
