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Questions and Answers
A scientist is studying a newly discovered aquatic organism. Upon microscopic examination, they observe that the organism is photosynthetic and has a cell wall containing silica. Based on these characteristics, to which group does this organism most likely belong?
A scientist is studying a newly discovered aquatic organism. Upon microscopic examination, they observe that the organism is photosynthetic and has a cell wall containing silica. Based on these characteristics, to which group does this organism most likely belong?
- Rhodophyta (red algae)
- Phaeophyta (brown algae)
- Chrysophyta (golden and yellow-green algae & diatoms) (correct)
- Chlorophyta (green algae)
Which of the following characteristics distinguishes algae from protozoans?
Which of the following characteristics distinguishes algae from protozoans?
- Unicellular structure
- Requirement for a moist environment
- Presence of a nucleus
- Ability to perform photosynthesis (correct)
A marine biologist is studying a species of algae and discovers that its cell walls contain agar. To which of the following groups does this alga most likely belong?
A marine biologist is studying a species of algae and discovers that its cell walls contain agar. To which of the following groups does this alga most likely belong?
- Rhodophyta (correct)
- Chlorophyta
- Phaeophyta
- Chrysophyta
During unfavorable environmental conditions, a protozoan can enter a dormant state. What is the name of this dormant form?
During unfavorable environmental conditions, a protozoan can enter a dormant state. What is the name of this dormant form?
If a scientist observes schizogony occurring in a microorganism, they are most likely studying which type of organism?
If a scientist observes schizogony occurring in a microorganism, they are most likely studying which type of organism?
Diatoms play a crucial role in global ecology. What is their major contribution?
Diatoms play a crucial role in global ecology. What is their major contribution?
A researcher is studying microorganisms from a pond and observes a unicellular, motile eukaryote that lacks a cell wall. This organism is most likely a:
A researcher is studying microorganisms from a pond and observes a unicellular, motile eukaryote that lacks a cell wall. This organism is most likely a:
Which of the following algal groups is characterized by having members with cell walls containing silica?
Which of the following algal groups is characterized by having members with cell walls containing silica?
What is the primary function of the trophozoite form in protozoans?
What is the primary function of the trophozoite form in protozoans?
A population of algae is observed to be reproducing rapidly through cell division without any exchange of genetic material. Which mode of reproduction is this population utilizing?
A population of algae is observed to be reproducing rapidly through cell division without any exchange of genetic material. Which mode of reproduction is this population utilizing?
Flashcards
Algae
Algae
Photosynthetic, aquatic organisms.
Chlorophyta
Chlorophyta
Green algae.
Rhodophyta
Rhodophyta
Red algae with cell walls containing agar.
Phaeophyta
Phaeophyta
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Chrysophyta
Chrysophyta
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Protozoans
Protozoans
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Trophozoite
Trophozoite
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Cyst
Cyst
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Schizogony
Schizogony
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Diatoms
Diatoms
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Study Notes
- Algae are photosynthetic, aquatic organisms.
- Algae reproduce both asexually and sexually.
Classification of Algae
- Chlorophyta: green algae
- Rhodophyta: red algae (cell wall contains agar)
- Phaeophyta: brown algae
- Chrysophyta: golden and yellow-green algae and diatoms
- The cell wall of Chrysophyta contains silica.
- Diatoms are a major source of the world’s oxygen.
Protozoans
- Protozoans are eukaryotes.
- Protozoans are unicellular and lack a cell wall.
- Most protozoans are motile.
- Protozoans require a moist environment to survive.
- Trophozoite: motile, active, feeding form
- Cyst: dormant form (unfavorable environment)
- Protozoans reproduce asexually through schizogony, where the nucleus undergoes multiple divisions before the cell divides.
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