Read the points given below and identify the cell organelle.
(a) The organelle remains continuous with the outer membrane of the nucleus. 
(b) It bears two types of glycoproteins, ribophorin I and ribophorin II on the surface.
(c) This organelle is involved in protein synthesis.

The rough endoplasmic reticulum mostly remains continuous with the outer membrane of the nucleus. 80s ribosomes binds by their larger subunit, with the help of two glycoproteins, Ribophorin I and II on the surface of Rough E.R. Rough ER is mostly involved in protein synthesis.