Final answer:
The two points on the process where endoplasmic reticulum (ER) can be found are the rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER). RER has ribosomes and is involved in protein synthesis, while SER lacks ribosomes.
Step-by-step explanation:
The two points on the process where endoplasmic reticulum (ER) can be found are the rough endoplasmic reticulum (RER) and the smooth endoplasmic reticulum (SER). RER is so-called because its membrane is dotted with ribosomes, giving it a bumpy appearance. Ribosomes on the RER are involved in protein synthesis, while SER lacks ribosomes.