Which transport process is the main mechanism for the movement of most macromolecules by body cells?
A. receptor-mediated endocytosis
B. pinocytosis
C. phagocytosis
D. secondary active transport
Answer:
A. receptor-mediated endocytosis
Explanation:
Receptor-mediated endocytosis is a highly selective type of endocytosis. It is a process by which the cells take up specific ligands which in turn bind to specific receptors. This is followed by the formation of a vesicle once a specific macromolecule in the extracellular fluid bind to its receptors. This process allows cells to take up LDLs, iron-transporting transferrin protein, antibodies, etc. The vesicles enter into the cell by the process of endocytosis.
