This is a membrane-bound organelle in eukaryotic cells that is the production and transportation of proteins.

The answer is: endoplasmic reticulum.

This organelle is composed of membrane-enclosed structures that look like tube or sacs known as cisternae. Its roles are role in the production, processing, and transport of proteins and lipids. There are two forms of endoplasmic reticulum (ER):

•Rough ER-covered with ribosomes which are the side of protein synthesis

•Smooth ER-involved in synthesis of lipids and steroids

From ER, newly formed proteins are transported to  lysosomes, Golgi apparatus, plasma membrane…

carbon atoms, hydrogen, oxygen, and nitrogen.

idk what happened..you tell