Final answer:
Endocytosis is the process by which cells ingest large molecules by enveloping them in a section of cell membrane that pinches off to form an internal vesicle.
Step-by-step explanation:
The movement of large molecules into a cell is called endocytosis. This is a type of active transport where particles, such as large molecules or even whole cells, are moved into the cell. Bulk transport refers to both endocytosis and exocytosis, the methods cells use to move large particles across the cell membrane.
The cell membrane invaginates, forming a pocket that engulfs the particle. This pocket then pinches off to form a new intracellular vesicle that contains the ingested material. Endocytosis can occur in different forms, including phagocytosis (the ingestion of large particles or cells) and pinocytosis (the ingestion of fluids and solutes). Bulk transport is a broader term that includes both endocytosis and exocytosis, processes by which cells move large particles into or out of the cell via vesicles.