Answer:
D. are attached to the outside of the nucleus
Explanation:
Ribosomes may be present free in the cytosol of the cells. Some ribosomes are attached to the surface of the endoplasmic reticulum. Since the presence of ribosomes makes the endoplasmic reticulum appear rough, they are called the rough endoplasmic reticulum. The membrane of rough endoplasmic reticulum is continuous with the outer nuclear membrane and is present outside the nucleus. Therefore, ribosomes are also attached to the outside of the nucleus.
