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Questions and Answers
What characteristic distinguishes eubacteria from other bacteria?
What characteristic distinguishes eubacteria from other bacteria?
Cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocysts.
Cyanobacteria can fix atmospheric nitrogen in specialized cells called heterocysts.
True
What is the primary reproductive method used by bacteria?
What is the primary reproductive method used by bacteria?
Fission
_________ are the smallest living cells known and can survive without oxygen.
_________ are the smallest living cells known and can survive without oxygen.
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Match the following types of bacteria with their functions:
Match the following types of bacteria with their functions:
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Study Notes
Eubacteria (True Bacteria)
- Thousands of different types exist, characterized by a rigid cell wall and, if motile, a flagellum.
Cyanobacteria (Blue-green Algae)
- Possess chlorophyll a, similar to green plants.
- Photosynthetic autotrophs.
- Unicellular, colonial, or filamentous.
- Freshwater, marine, or terrestrial.
- Colonies often surrounded by a gelatinous sheath.
- Can form blooms in polluted water bodies.
- Some fix atmospheric nitrogen in specialized cells called heterocysts (e.g., Nostoc, Anabaena).
Chemosynthetic Autotrophic Bacteria
- Oxidize inorganic substances (nitrates, nitrites, ammonia) for ATP production.
- Play a crucial role in nutrient recycling (nitrogen, phosphorus, iron, sulfur).
Heterotrophic Bacteria
- Abundant in nature.
- Primarily important decomposers.
- Impact human affairs:
- Produce curd from milk.
- Produce antibiotics.
- Fix nitrogen in legume roots.
- Some are pathogens causing diseases (cholera, typhoid, tetanus, citrus canker) - affecting humans, crops, farm animals, and pets.
Bacterial Reproduction
- Primarily reproduce by binary fission.
- Can produce spores under unfavorable conditions.
- Exhibit a primitive form of sexual reproduction through DNA transfer.
Mycoplasma
- Lack a cell wall.
- Smallest known living cells.
- Can survive without oxygen.
- Many are pathogenic to animals and plants.
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Description
Explore the various types of bacteria, including Eubacteria, Cyanobacteria, and their roles in ecosystems. This quiz covers photosynthesis, nutrient recycling, and the significance of heterotrophic bacteria in human affairs. Test your knowledge on how these microorganisms impact our world!
