Multiple Choice
Pinocytosis is the process in which the cell:
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13. Intracellular Protein Transport
Endocytic Pathways
Multiple Choice
In the context of endocytic pathways, are endocytosis and exocytosis considered forms of passive transport or active transport?
A
Both are active transport processes because they require energy for vesicle formation, trafficking, and membrane fusion.
B
Both are passive transport processes because materials move down their concentration gradients without energy input.
C
Endocytosis is active transport, but exocytosis is passive transport.
D
Endocytosis is passive transport, but exocytosis is active transport.
Verified step by step guidance1
Understand the definitions of passive and active transport: Passive transport does not require energy and moves substances down their concentration gradients, while active transport requires energy to move substances against gradients or to facilitate complex processes.
Recall that endocytosis involves the cell membrane engulfing materials to bring them into the cell via vesicle formation, which requires energy input for membrane remodeling and vesicle trafficking.
Recognize that exocytosis involves vesicles fusing with the plasma membrane to release contents outside the cell, a process that also requires energy for vesicle movement and membrane fusion.
Since both endocytosis and exocytosis involve vesicle formation, trafficking, and membrane fusion, all of which consume cellular energy (usually ATP), they are classified as active transport mechanisms.
Conclude that both endocytosis and exocytosis are active transport processes because they require energy, rather than passive transport which occurs without energy input.
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