Final answer:
The statement regarding transcytosis being a receptor-mediated transfer of macromolecules across the cell is true. It involves receptor-mediated endocytosis followed by exocytosis, and is a selective process that transports specific substances such as hormones and iron.
Step-by-step explanation:
The statement that transcytosis is receptor mediated transfer of macromolecules from one side of the cell to the other is true. Transcytosis is a combination of endocytosis and exocytosis processes used by cells to transport macromolecules across the cell membrane and release them on the opposite side. Receptor-mediated endocytosis is specifically a form of endocytosis where cells engulf substances by targeting specific substances that bind to receptors on the cell membrane. Examples of substances that use this pathway include hormones, iron via transferrin, and different viruses and bacteria. After binding, the cell will then endocytose the portion of the cell membrane that contains the receptor-ligand complexes. The vesicle or endosome that forms then moves across the cell to be released by exocytosis on the opposite side.
Phagocytosis and pinocytosis are other types of endocytosis, but they are typically not highly selective. Receptor-mediated endocytosis, however, is selective as it relies on the binding affinity of the receptor to its specific ligand.
Complete question:
Transcytosis is receptor mediated transfer of macromolecules from one side of the cell to the other.
True
False