Multiple Choice
In endocytosis, in which direction do substances move relative to the cell membrane?
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6. The Membrane
Endocytosis and Exocytosis
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What is receptor-mediated endocytosis?
A
The release of substances from a cell through vesicles that fuse with the plasma membrane.
B
A type of passive transport that does not require energy input from the cell.
C
A form of endocytosis where cells internalize molecules by the inward budding of the plasma membrane, involving specific receptor proteins.
D
A process by which cells engulf large particles or cells by wrapping them in a portion of the plasma membrane.
Verified step by step guidance1
Receptor-mediated endocytosis is a specific type of endocytosis, which is a process cells use to internalize substances from their external environment.
In receptor-mediated endocytosis, specific molecules outside the cell bind to receptor proteins on the cell's surface. These receptors are highly selective and only bind to certain molecules.
Once the target molecules bind to the receptors, the plasma membrane begins to invaginate, or fold inward, forming a pocket around the bound molecules.
This invagination continues until the pocket pinches off from the plasma membrane, forming a vesicle that contains the receptor-bound molecules inside the cell.
The vesicle can then transport the internalized molecules to different parts of the cell for processing, or they may be directed to lysosomes for degradation.
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