Which of the following is not produced by the smooth endoplasmic reticulum?

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Lipids

Cholesterol

Steroid hormones

Proteins

answer is D.

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Detailed Solution

The smooth endoplasmic reticulum (SER ) found in eukaryotic cells lacks ribosomes on its surface. It is involved in lipid synthesis and detoxification of drugs and toxins. It contains enzymes that catalyze the reactions necessary for the production of lipids, including phospholipids and cholesterol.

Phospholipids are important components of cell membranes, and cholesterol plays a crucial role in regulating membrane fluidity and permeability. Additionally, the SER is involved in the synthesis of steroid hormones, such as estrogen and testosterone.

Unlike the rough endoplasmic reticulum (RER), the SER is not involved in protein synthesis, which is exclusively carried out by ribosomes attached to the RER.

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