You are presented with the question "Endoplasmic reticulum are what attached to structures in the cytoplasm where proteins are made?" and the following answer choices: 
- recycling
 - allow growth
 - membranes
 - organ
 - layers of fat
 - more abundant
 - epidermal
 - Most plants

Now knowing that ribosomes are structures in the cytoplasm where proteins are made and endoplasmic reticulum are membranes attached to ribosomes, choose the best answer.


 

   membranes      