Podcast
Questions and Answers
Which characteristic is common to all eubacteria?
Which characteristic is common to all eubacteria?
- Capacity to fix atmospheric nitrogen
- Motility via flagellum
- Presence of a rigid cell wall (correct)
- Ability to perform photosynthesis
Cyanobacteria are classified as photosynthetic autotrophs because they possess which of the following?
Cyanobacteria are classified as photosynthetic autotrophs because they possess which of the following?
- A gelatinous sheath
- Heterocysts
- Chlorophyll a (correct)
- Ability to form colonies
What role do heterocysts play in certain cyanobacteria such as Nostoc and Anabaena?
What role do heterocysts play in certain cyanobacteria such as Nostoc and Anabaena?
- Storing excess photosynthetic products
- Facilitating movement in aquatic environments
- Providing structural support to colonies
- Fixing atmospheric nitrogen (correct)
Chemosynthetic autotrophic bacteria obtain energy for ATP production through which process?
Chemosynthetic autotrophic bacteria obtain energy for ATP production through which process?
What ecological role is primarily associated with heterotrophic bacteria?
What ecological role is primarily associated with heterotrophic bacteria?
Which of the following processes is facilitated by heterotrophic bacteria in the context of human affairs?
Which of the following processes is facilitated by heterotrophic bacteria in the context of human affairs?
Which of the following represents a significant role of eubacteria in nutrient cycling?
Which of the following represents a significant role of eubacteria in nutrient cycling?
In what type of environment are blooms commonly formed by cyanobacteria?
In what type of environment are blooms commonly formed by cyanobacteria?
Other than sunlight, what source of energy do chemosynthetic autotrophic bacteria utilize to produce ATP?
Other than sunlight, what source of energy do chemosynthetic autotrophic bacteria utilize to produce ATP?
What is the purpose of the gelatinous sheath that surrounds colonies of cyanobacteria?
What is the purpose of the gelatinous sheath that surrounds colonies of cyanobacteria?
Which of the following explains how eubacteria's rigid cell wall contributes to its survival and function?
Which of the following explains how eubacteria's rigid cell wall contributes to its survival and function?
How do cyanobacteria contribute to the balance of nutrients in their environments?
How do cyanobacteria contribute to the balance of nutrients in their environments?
What specific human application relies on the activity of heterotrophic bacteria?
What specific human application relies on the activity of heterotrophic bacteria?
Which of the following determines the classification of cyanobacteria as autotrophs?
Which of the following determines the classification of cyanobacteria as autotrophs?
Considering their role in the environment, what would be the most significant consequence of a drastic reduction in heterotrophic bacteria?
Considering their role in the environment, what would be the most significant consequence of a drastic reduction in heterotrophic bacteria?
How does the activity of chemosynthetic autotrophic bacteria contribute to environmental health?
How does the activity of chemosynthetic autotrophic bacteria contribute to environmental health?
What adaptation enables cyanobacteria to thrive in diverse environments, such as freshwater, marine, and terrestrial habitats?
What adaptation enables cyanobacteria to thrive in diverse environments, such as freshwater, marine, and terrestrial habitats?
How do heterotrophic and chemosynthetic bacteria differ in their methods of obtaining energy?
How do heterotrophic and chemosynthetic bacteria differ in their methods of obtaining energy?
If a new bacterial species is discovered and observed to form blooms in polluted water, what other characteristic would likely be present?
If a new bacterial species is discovered and observed to form blooms in polluted water, what other characteristic would likely be present?
What property of eubacteria makes them vital in commercial processes such as the production of antibiotics?
What property of eubacteria makes them vital in commercial processes such as the production of antibiotics?
Flashcards
Eubacteria
Eubacteria
True bacteria characterized by a rigid cell wall and, if motile, a flagellum.
Cyanobacteria
Cyanobacteria
Bacteria containing chlorophyll a, similar to green plants, performing photosynthesis.
Heterocysts
Heterocysts
Structures used by some organisms to fix atmospheric nitrogen.
Chemosynthetic Autotrophs
Chemosynthetic Autotrophs
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Heterotrophic Bacteria
Heterotrophic Bacteria
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Methane
Methane
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Flagellum
Flagellum
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Autotroph
Autotroph
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Chemosynthesis
Chemosynthesis
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Heterotroph
Heterotroph
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Study Notes
Eubacteria
- There are thousands of different types of eubacteria, also known as 'true bacteria'.
- Eubacteria are characterized by:
- A rigid cell wall
- A flagellum, if motile
- Cyanobacteria are also called blue-green algae.
- They contain chlorophyll a, similar to green plants
- They are photosynthetic autotrophs
- Cyanobacteria can be:
- Unicellular
- Colonial
- Filamentous
- They can be found in:
- Freshwater
- Marine environments
- Terrestrial environments
- Colonies are surrounded by a gelatinous sheath
- Cyanobacteria often form blooms in polluted water bodies.
- Some cyanobacteria fix atmospheric nitrogen in specialized cells called heterocysts.
- Examples include Nostoc and Anabaena.
- Chemosynthetic autotrophic bacteria oxidize inorganic substances like nitrates, nitrites, and ammonia.
- They use the released energy for ATP production.
- They play a role in recycling nutrients like nitrogen, phosphorus, iron, and sulphur.
Heterotrophic Bacteria
- Heterotrophic bacteria are the most abundant in nature.
- The majority of heterotrophic bacteria are important decomposers.
- Many have a significant impact on human affairs.
- They are helpful in:
- Making curd from milk
- Production of antibiotics
- Fixing nitrogen in legumes
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