Pancreatic cells are abundant in which organelle to meet protein production demands?

The rough endoplasmic reticulum (RER) is the correct answer because it is primarily responsible for the synthesis of proteins, particularly those that are secreted from the cell or are destined for use in the cell membrane. Pancreatic cells, specifically those that produce digestive enzymes, have a high demand for protein production to supply the enzymes necessary for digestion. The presence of ribosomes on the surface of the rough endoplasmic reticulum gives it a "rough" appearance and facilitates the translation of mRNA into polypeptides, which are then folded and modified within the RER.

This organelle plays a crucial role in processing these proteins before they are transported to the Golgi apparatus for further modification and packaging, which aligns perfectly with the functional needs of the pancreas. The abundance of rough endoplasmic reticulum in these cells is an adaptation to their role in protein production and secretion, making it essential for their function.