Which one of the following functions is not carried out by smooth endoplasmic reticulum?

The smooth endoplasmic reticulum (SER) is a membrane-bound organelle characterized by the absence of ribosomes on its surface. Its primary functions include the synthesis of lipids, phospholipids, and steroid hormones such as testosterone and estrogen [2]. It also plays a critical role in carbohydrate metabolism, detoxification of drugs and poisons, and the storage of calcium ions [1]. While the SER is involved in the transport of materials within the cell via vesicles [2], it is not responsible for protein synthesis. Protein synthesis is the specific function of the rough endoplasmic reticulum (RER), which is studded with ribosomes that facilitate the translation of proteins destined for secretion or membrane integration [2]. Therefore, the synthesis of protein is the function not carried out by the smooth endoplasmic reticulum.

Sources

1. [1] https://www.sciencedirect.com/topics/immunology-and-microbiology/smooth-endoplasmic-reticulum
2. [2] https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/smooth-endoplasmic-reticulum