Multiple choice The endoplasmic reticulum without attached ribosomes is called Rough endoplasmic reticulum Smooth endoplasmic reticulum Sarcoplasmic reticulum Cisternae Vesicles Reveal answer Fill a bubble to check yourself B Correct answer Explanation Correct answer. The endoplasmic reticulum without attached ribosomes is called a granular or smooth endoplasmic reticulum.