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Questions and Answers
During phagocytosis, what is the direct result of the fusion of a lysosome and a phagosome?
During phagocytosis, what is the direct result of the fusion of a lysosome and a phagosome?
- The creation of a phagolysosome where digestion occurs. (correct)
- The formation of a new phagocyte.
- The immediate elimination of debris from the cell.
- The initiation of chemotaxis to attract more microbes.
Which of the following processes occurs first during phagocytosis?
Which of the following processes occurs first during phagocytosis?
- Chemotaxis (correct)
- Fusion
- Elimination
- Ingestion
What cellular structures are responsible for the actual killing of a microbe during phagocytosis?
What cellular structures are responsible for the actual killing of a microbe during phagocytosis?
- The mitochondria.
- The cell membrane.
- The nucleus.
- Digestive enzymes within the lysosome. (correct)
After a phagocyte engulfs and destroys a microbe, what process allows the cell to expel the waste products?
After a phagocyte engulfs and destroys a microbe, what process allows the cell to expel the waste products?
What is the role of membrane extensions during the ingestion phase of phagocytosis?
What is the role of membrane extensions during the ingestion phase of phagocytosis?
Which event characterizes the 'killing' stage of phagocytosis?
Which event characterizes the 'killing' stage of phagocytosis?
If a cell is NOT capable of phagocytosis, what is it NOT called?
If a cell is NOT capable of phagocytosis, what is it NOT called?
How does a phagocyte initially recognize an invading microbe during phagocytosis?
How does a phagocyte initially recognize an invading microbe during phagocytosis?
Why is the formation of a phagolysosome a critical step in phagocytosis?
Why is the formation of a phagolysosome a critical step in phagocytosis?
What is the sequence of the main events in phagocytosis?
What is the sequence of the main events in phagocytosis?
In the context of phagocytosis, what distinguishes 'ingestion' from 'elimination'?
In the context of phagocytosis, what distinguishes 'ingestion' from 'elimination'?
Consider a scenario where a phagocyte is unable to fuse its lysosomes with a phagosome. What stage of phagocytosis would be directly affected?
Consider a scenario where a phagocyte is unable to fuse its lysosomes with a phagosome. What stage of phagocytosis would be directly affected?
What is the primary function of signal molecules on the surface of a microbe during phagocytosis?
What is the primary function of signal molecules on the surface of a microbe during phagocytosis?
Which of the following cellular components is NOT directly involved in the process of phagocytosis?
Which of the following cellular components is NOT directly involved in the process of phagocytosis?
A certain bacterium has mutated to prevent the production of surface signal molecules. What stage of phagocytosis will be most immediately hindered by this mutation?
A certain bacterium has mutated to prevent the production of surface signal molecules. What stage of phagocytosis will be most immediately hindered by this mutation?
How does the process of elimination contribute to the overall effectiveness of phagocytosis?
How does the process of elimination contribute to the overall effectiveness of phagocytosis?
What would be the most likely consequence if a phagocyte lacked the necessary enzymes within its lysosomes?
What would be the most likely consequence if a phagocyte lacked the necessary enzymes within its lysosomes?
During phagocytosis, what is the role of the phagosome prior to fusion?
During phagocytosis, what is the role of the phagosome prior to fusion?
Which of the following is the most direct result of a defect in the process of chemotaxis during phagocytosis?
Which of the following is the most direct result of a defect in the process of chemotaxis during phagocytosis?
A researcher observes that a certain phagocyte can ingest microbes but cannot digest them. Which stage of phagocytosis is most likely impaired in this cell?
A researcher observes that a certain phagocyte can ingest microbes but cannot digest them. Which stage of phagocytosis is most likely impaired in this cell?
Flashcards
Phagocytosis
Phagocytosis
The process by which cells engulf and ingest other cells or particles.
Phagocytes
Phagocytes
Cells that are capable of performing phagocytosis.
Chemotaxis (in Phagocytosis)
Chemotaxis (in Phagocytosis)
The first stage of phagocytosis, involving the attraction of phagocytes to microbes via chemical signals.
Ingestion (in Phagocytosis)
Ingestion (in Phagocytosis)
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Fusion (in Phagocytosis)
Fusion (in Phagocytosis)
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Killing (in Phagocytosis)
Killing (in Phagocytosis)
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Elimination (in Phagocytosis)
Elimination (in Phagocytosis)
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Phagosome
Phagosome
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Phagolysosome
Phagolysosome
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Study Notes
- Phagocytosis is performed by cells called phagocytes.
- The phagocytosis process has five stages.
Chemotaxis
- Chemotaxis is the recognition of an invader.
- Recognition occurs due to signal molecules on the microbe surface.
Ingestion
- During ingestion, membrane extensions surround the microbe.
- A phagosome is formed.
Fusion
- A lysosome fuses with the phagosome.
- A phagolysosome is created in the process of fusion.
Killing
- Digestive enzymes in the lysosome destroy the microbe.
Elimination
- Debris is discharged out of the cell.
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