Question

Endoplasmic reticulum (ER) is the site of all of the following EXCEPT

A. Drug detoxification by means of mixed function oxidases
B. Synthesis of proteins that are secreted from the cell
C. N-linked glycosylation of newly formed polypeptides
D. Ca2+ storage in muscle tissues
E. Hydrolytic activities carried out by acid hydrolases

Answer 1

The endoplasmic reticulum (ER) is involved in various functions in the cell. The RER synthesizes secreted proteins and glycosylates polypeptides. It also stores calcium ions in muscle tissues. However, drug detoxification and hydrolytic activities occur in other organelles.

Step-by-step explanation:

The endoplasmic reticulum (ER) is a network of membranous sacs and tubules in the cell that is responsible for various functions.

The rough endoplasmic reticulum (RER), which is studded with ribosomes, is involved in the synthesis of proteins that are secreted from the cell and N-linked glycosylation of newly formed polypeptides.

The ER also stores calcium ions in muscle tissues. However, drug detoxification and hydrolytic activities carried out by acid hydrolases occur in other cellular organelles and not in the ER.