Protista Flashcards
What type of organisms are characterized by having a membrane-enclosed nucleus and membrane-enclosed organelles?
Eukaryotic
Eukaryotic cells are distinct from prokaryotic cells, which do not have a nucleus.
Name three examples of protists.
- Amoeba
- Algae
- Paramecium
Protists are a diverse group of eukaryotic microorganisms.
What is a key structural feature of amoeba?
Nucleus
The nucleus contains the genetic material of the amoeba.
What is the function of the contractile vacuole in amoeba?
Regulates water balance
The contractile vacuole helps to expel excess water from the amoeba.
What are the two types of cytoplasm found in amoeba?
- Ectoplasm
- Endoplasm
Ectoplasm is the outer layer, while endoplasm is the inner layer of the cytoplasm.
What structure in amoeba is responsible for movement and feeding?
Pseudopodia
Pseudopodia are temporary projections that amoeba use to move and engulf food.
What is the role of the cell membrane in eukaryotic cells?
Keeps the contents of the cell in place
The cell membrane is semi-permeable and plays a crucial role in maintaining homeostasis.
True or False: The cell membrane provides a rigid structure to the cell.
False
The cell membrane is flexible and does not provide rigidity.
Fill in the blank: Amoeba has a _______ that contains its genetic material.
nucleus
The nucleus is essential for the regulation of cellular activities.
What is the function of the food vacuole?
Secretes acids and enzymes to kill and digest the prey.
Food vacuoles are essential for the digestion process in amoebas.
What role do pseudopodia play in amoeba movement?
Needed for movement and catching prey.
Pseudopodia are temporary projections that aid in locomotion and feeding.
What happens to ectoplasm when an amoeba wants to move?
Ectoplasm moves out in the direction the amoeba wants to move.
This process helps the amoeba extend its body and propel itself.
What occurs after ectoplasm moves out in an amoeba?
Then the endoplasm flows into the pseudopodia.
This flow helps to fill the pseudopodia, enabling movement.
What is the function of the contractile vacuole?
Needed for osmoregulation.
Osmoregulation is crucial for maintaining the internal balance of water and solutes.
How does water enter the contractile vacuole?
Water rushes in by osmosis in a less concentrated solute.
Osmosis is the movement of water across a semi-permeable membrane.
What happens to excess water in the amoeba?
Excess water enters the contractile vacuole.
This is a key process for preventing the amoeba from swelling and bursting.
What does the contractile vacuole do with the water?
The contractile vacuole moves to the edge of the amoeba and expels the water.
This expulsion is crucial for maintaining osmotic balance.
What is the function of the food vacuole?
Secretes acids and enzymes to kill and digest the prey.
Food vacuoles are essential for the digestion process in amoebas.
What role do pseudopodia play in amoeba movement?
Needed for movement and catching prey.
Pseudopodia are temporary projections that aid in locomotion and feeding.
What happens to ectoplasm when an amoeba wants to move?
Ectoplasm moves out in the direction the amoeba wants to move.
This process helps the amoeba extend its body and propel itself.
What occurs after ectoplasm moves out in an amoeba?
Then the endoplasm flows into the pseudopodia.
This flow helps to fill the pseudopodia, enabling movement.
What is the function of the contractile vacuole?
Needed for osmoregulation.
Osmoregulation is crucial for maintaining the internal balance of water and solutes.
How does water enter the contractile vacuole?
Water rushes in by osmosis in a less concentrated solute.
Osmosis is the movement of water across a semi-permeable membrane.
What happens to excess water in the amoeba?
Excess water enters the contractile vacuole.
This is a key process for preventing the amoeba from swelling and bursting.
What does the contractile vacuole do with the water?
The contractile vacuole moves to the edge of the amoeba and expels the water.
This expulsion is crucial for maintaining osmotic balance.
