You are presented with the quiz "Where are the structures where proteins are made located on?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "ribosomes are structures in the cytoplasm where proteins are made" and "rough endoplasmic reticulum has ribosomes attached d". 

So, what's the best answer to the question?


 

     rough endoplasmic reticulum      