Multiple choice What is look like long tubules or round or oblong bags ? Vacuoles Golgi apparatus Endoplasmic reticulum PLastids Reveal answer Fill a bubble to check yourself C Correct answer Explanation The Endoplasmic Reticulum (ER) is a large network of membrane-bound tubes and sheets. It appears as long tubules or round or oblong bags (vesicles) and is involved in protein and lipid synthesis.