Multiple Choice
In the context of endocytic pathways, a cell engulfing a relatively large particle (e.g., a bacterium or cell debris) will most likely utilize which uptake mechanism?
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13. Intracellular Protein Transport
Endocytic Pathways
Multiple Choice
Pinocytosis is the process in which the cell:
A
Nonspecifically internalizes extracellular fluid and dissolved solutes via small endocytic vesicles
B
Directly transports ions across the plasma membrane through ATP-powered pumps without vesicle formation
C
Exports cytosolic proteins to the extracellular space by fusion of secretory vesicles with the plasma membrane
D
Engulfs large particles such as bacteria using actin-driven pseudopods to form a phagosome
Verified step by step guidance1
Step 1: Understand the definition of pinocytosis. Pinocytosis is a form of endocytosis where the cell takes in extracellular fluid and dissolved solutes nonspecifically through small vesicles formed from the plasma membrane.
Step 2: Differentiate pinocytosis from other cellular processes. For example, active transport involves ATP-powered pumps moving ions directly across the membrane without vesicle formation, which is not pinocytosis.
Step 3: Recognize that exocytosis is the process of exporting materials from the cell by fusion of secretory vesicles with the plasma membrane, which is different from pinocytosis.
Step 4: Understand that phagocytosis involves engulfing large particles like bacteria using actin-driven pseudopods to form phagosomes, which is distinct from pinocytosis that deals with fluid and solutes.
Step 5: Conclude that pinocytosis specifically refers to the nonspecific internalization of extracellular fluid and dissolved solutes via small endocytic vesicles.
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