Amoeba Quiz: Test Your Knowledge of Microorganisms

The cell is filled with two different types of ______

Ectoplasm is a thick jelly-like material that forms a thin layer just ______ the cell membrane

Endoplasm is a more fluid, jelly-like material that fills the ______ of the cell

Osmoregulation is the process by which cells regulate the concentration of ______ within the cell

The contractile vacuole eliminates ______ water which comes as a by-product of respiration

Water is actively transported into the ______ vacuole

Many mitochondria surround the contractile vacuole producing the necessary ______

Movement is achieved by structures called ______ which develop on Amoeba

Amoeba feed by a process known as ______

During binary fission, Amoeba withdraws its pseudopodia and becomes ______ in shape

The ______ divides in two during binary fission

The cytoplasm between the two nuclei divides in two, resulting in ______ identical daughter cells

Lysosomes fuse with the food vacuole to supply ______ enzymes

Undigested food is left behind during ______

Reproduction in Amoeba occurs through a process called ______ fission

The two nuclei move apart during binary fission, resulting in ______ daughter cells

The food vacuole moves to the edge of the cell during ______

The products of digestion are adsorbed into the cytoplasm through the ______

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

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!