Ribosomes are structures in the cytoplasm where proteins are made, and endoplasmic reticulum are membranes attached to ribosomes. Given these facts, endoplasmic reticulum are what attached to structures in the cytoplasm where proteins are made among the following options:
- recycling
 - allow growth
 - membranes
 - organ
 - layers of fat
 - more abundant
 - epidermal
 - Most plants


 

   membranes      