Final answer:
The endoplasmic reticulum (ER) is a series of interconnected membranous sacs and tubules that modify proteins and synthesize lipids. The rough ER produces membranes and ribosomes on its surface make membrane and secretory proteins, while the smooth ER synthesizes lipids and processes toxins.
Step-by-step explanation:
The endoplasmic reticulum (ER) is a series of interconnected membranous sacs and tubules that collectively modify proteins and synthesize lipids.
There are two types of ER: the rough ER that produces membranes and has ribosomes on its surface making membrane and secretory proteins, and the smooth ER that synthesizes lipids and processes toxins.
The rough ER works with Golgi apparatus to transport new proteins to their proper destinations in the cell. The smooth ER is involved in lipid biosynthesis, carbohydrate metabolism, and detoxification of toxic compounds within the cell.