The process used by cells to bring in large molecules is called endocytosis.

Here's a breakdown:

* Endocytosis: The process where a cell engulfs a substance, typically a large molecule, by forming a pocket in its membrane that pinches off to create a vesicle containing the substance.

There are three main types of endocytosis:

* Phagocytosis: Cell "eating" - engulfing solid particles like bacteria or debris.

* Pinocytosis: Cell "drinking" - engulfing fluids and dissolved substances.

* Receptor-mediated endocytosis: Specific molecules bind to receptors on the cell membrane, triggering the formation of a vesicle to bring in the bound substance.

Let me know if you'd like more detail on any of these processes!