Question

the smooth endoplasmic reticulum is composed of —— within the cell. folded membranes a tubular network microcompartments membranes with ribosomes

Explanation:

The smooth endoplasmic reticulum is a network of folded membranes within the cell. It lacks ribosomes attached to its surface, differentiating it from the rough endoplasmic reticulum. It plays roles in lipid synthesis, detoxification, and calcium ion storage.

Answer:

folded membranes