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Questions and Answers
What is the primary function of contractile vacuoles in amoebas?
What is the primary function of contractile vacuoles in amoebas?
- To regulate osmotic pressure (correct)
- To synthesize proteins
- To store food particles
- To produce ATP
Which of the following is a characteristic of amoeba movement?
Which of the following is a characteristic of amoeba movement?
- Using flagella
- Slow and irregular (correct)
- Through muscle contraction
- Fast and directional
What is the method of nutrition in amoebas?
What is the method of nutrition in amoebas?
- Heterotrophic, obtaining energy by consuming other organisms (correct)
- Decomposers, breaking down organic matter
- Symbiotic, relying on other organisms for energy
- Autotrophic, producing energy through photosynthesis
Which type of amoeba is known to cause amoebiasis in humans?
Which type of amoeba is known to cause amoebiasis in humans?
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What is the result of asexual reproduction by binary fission in amoebas?
What is the result of asexual reproduction by binary fission in amoebas?
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What is the function of pseudopodia in amoebas?
What is the function of pseudopodia in amoebas?
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Study Notes
What is an Amoeba?
- A type of protozoan, a single-celled organism
- Belongs to the kingdom Protista
- Characterized by their ability to change shape
Structure
- No fixed shape, but typically irregular or spherical
- Composed of:
- Cell membrane
- Cytoplasm
- Nucleus
- Food vacuoles
- Contractile vacuoles (for osmoregulation)
Movement
- Amoebas move using pseudopodia (false feet)
- Pseudopodia are temporary extensions of the cell membrane
- Movement is slow and irregular
Nutrition
- Heterotrophic, obtaining energy by consuming other organisms
- Feed on bacteria, algae, and small invertebrates
- Ingest food particles through phagocytosis
Reproduction
- Asexual reproduction by binary fission
- Division occurs in multiple directions, resulting in two or more daughter cells
- Can also reproduce sexually through conjugation
Types of Amoebas
- Amoeba proteus: a common freshwater amoeba
- Amoeba dubia: a species of amoeba often used in scientific research
- Entamoeba histolytica: a parasitic amoeba that causes amoebiasis in humans
What is an Amoeba?
- A single-celled organism, belonging to the kingdom Protista
- Characterized by ability to change shape due to lack of cell wall
Structure
- No fixed shape, irregular or spherical in shape
- Composed of cell membrane, cytoplasm, nucleus, food vacuoles, and contractile vacuoles for osmoregulation
- Cell membrane is flexible, allowing for shape changes
Movement
- Move using pseudopodia, temporary extensions of cell membrane
- Pseudopodia are formed by cytoplasm flowing into a specific area
- Movement is slow and irregular, helping in capturing food particles
Nutrition
- Heterotrophic, obtaining energy by consuming other organisms
- Feed on bacteria, algae, and small invertebrates
- Use phagocytosis to ingest food particles, engulfing them with pseudopodia
Reproduction
- Asexual reproduction through binary fission
- Division occurs in multiple directions, resulting in two or more daughter cells
- Can also reproduce sexually through conjugation, involving exchange of genetic material
Types of Amoebas
- Amoeba proteus: common freshwater amoeba
- Amoeba dubia: species often used in scientific research
- Entamoeba histolytica: parasitic amoeba causing amoebiasis in humans
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