Question

multiple choice question
____ are often attached to the endoplasmic reticulum.

○ nucleoli
○ ribosomes
○ mitochondria

Explanation:

To solve this, we recall cell structure: Nucleoli are in the nucleus, mitochondria are organelles for energy, while ribosomes are often attached to the rough endoplasmic reticulum (RER) for protein synthesis.

Answer:

B. Ribosomes