Question

the portion of the membrane system in eukaryotic cells that is responsible for the making lipids and breaking down toxic substances is the
a rough er.
b smooth er.
c ribosomal er.
d semi - permeable er.

Explanation:

The smooth endoplasmic reticulum (ER) synthesizes lipids and detoxifies harmful substances in eukaryotic cells. The rough ER is mainly involved in protein synthesis, and there are no such things as ribosomal ER and semi - permeable ER in the context of these functions.

Answer:

B. smooth ER