Becker, B., Bolinger, B. & Melkonian, M. Anterograde transport of algal scales through the Golgi complex is not mediated by vesicles. Trends in Cell Biology 5, 305–307 (1995) doi: 10.1016 ...

Cells have extensive sets of intracellular ... The carbohydrates that the Golgi attaches to membrane proteins are often quite complex, and their synthesis requires multiple steps.

and the Golgi apparatus, which dispatches them to their destination, possibly by infolding of their cell membranes. All of this set the scene for the emergence of complex, multicellular life forms.