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Questions and Answers
The cell is filled with two different types of ______
cytoplasm
Ectoplasm is a thick jelly-like material that forms a thin layer just ______ the cell membrane
inside
Endoplasm is a more fluid, jelly-like material that fills the ______ of the cell
rest
Osmoregulation is the process by which cells regulate the concentration of ______ within the cell
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The contractile vacuole eliminates ______ water which comes as a by-product of respiration
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Water is actively transported into the ______ vacuole
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Many mitochondria surround the contractile vacuole producing the necessary ______
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Movement is achieved by structures called ______ which develop on Amoeba
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Amoeba feed by a process known as ______
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During binary fission, Amoeba withdraws its pseudopodia and becomes ______ in shape
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The ______ divides in two during binary fission
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The cytoplasm between the two nuclei divides in two, resulting in ______ identical daughter cells
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Lysosomes fuse with the food vacuole to supply ______ enzymes
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Undigested food is left behind during ______
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Reproduction in Amoeba occurs through a process called ______ fission
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The two nuclei move apart during binary fission, resulting in ______ daughter cells
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The food vacuole moves to the edge of the cell during ______
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The products of digestion are adsorbed into the cytoplasm through the ______
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Study Notes
Amoeba Structure
- The cell is filled with two types of cytoplasm: ectoplasm (a thick jelly-like material that forms a thin layer just inside the cell membrane) and endoplasm (a more fluid, jelly-like material that fills the rest of the cell)
- Cell organelles are suspended in the endoplasm
- Endoplasm is also involved in movement
Osmoregulation
- Osmoregulation is the process by which cells regulate the concentration of water within the cell
- Excess water is eliminated through the contractile vacuole, which is actively filled with water and surrounded by mitochondria that produce the necessary energy
- The vacuole bursts and expels the water when it reaches the surface of the cell
Movement
- Movement is achieved through pseudopodia, which develop in response to environmental conditions
- Chemotaxis: chemicals released by prey attract Amoeba, while other conditions repel it
- Endoplasm flows into the pseudopodia, causing Amoeba to move in that direction
- This type of motion is described as amoeboid motion
Feeding
- Amoeba feed by a process known as phagocytosis
- A layer of cell membrane surrounds the food particle, forming a food vacuole
- Lysosomes fuse with the food vacuole and supply digestive enzymes to break down the food
- Products are absorbed through the membrane into the cytoplasm, while undigested food is left behind through egestion
Reproduction
- Reproduction occurs through binary fission
- Amoeba withdraws its pseudopodia and becomes rounder in shape when it reaches a certain size
- Nucleus divides into two, and the two nuclei move apart
- Cytoplasm divides in two, with each half enclosing a nucleus, resulting in two identical daughter cells
- The process takes approximately 30 minutes
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Description
Test your knowledge about the structure and characteristics of the Amoeba, a free-living eukaryotic organism that feeds on bacteria and other organisms in water. Learn about the different types of cytoplasm and more in this quiz!
