A eukaryotic cell has extensive rough endoplasmic reticulum, a prominent Golgi apparatus and large, numerous nucleoli. W
RER is abundant in cells involved in protein synthesis and secretion. The Golgi apparatus modifies and packages proteins, while large and numerous nucleoli occur in cells actively carrying out protein synthesis because the nucleolus synthesises ribosomal RNA.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Endomembrane System - ER Golgi Lysosome Vacuole