Question

The smooth endoplasmic reticulum is well developed in the cells, which synthesize
A. Steroids and lipids
B. Carbohydrates
C. Proteins
D. All of the above

Answer 1

Hint: Rough endoplasmic reticulum is attached with ribosomes that are the regions of protein synthesis. The smooth endoplasmic reticulum lacks ribosomes.

Complete answer:
- The endoplasmic reticulum is of two types on the basis of present or absence of ribosome. When a ribosome is attached with the endoplasmic reticulum then called a rough endoplasmic reticulum due to the rough surface. When a ribosome is absent then it is called a smooth endoplasmic reticulum.
- The smooth endoplasmic reticulum performs a main role in generating lipids as the enzymes implanted in these smooth membranes. It generates the phospholipids and cholesterol utilized in formation of membrane, and along with the membrane proteins generated by the rough Endoplasmic reticulum; it can produce more membrane for itself, for the Golgi complex, the cell membrane, lysosomes, and others.
- SER metabolizes carbohydrates. Smooth endoplasmic reticulum does not synthesize protein as they lack ribosomes.

Thus, the correct option is A. i.e. Steroids and lipids.

Note: The smooth endoplasmic reticulum functions in many metabolic processes. It produces phospholipids, lipids for steroids and plasma membranes respectively. Cells that release these components, like the testes cells, ovaries, and skin oil glands, contain an extra of a smooth endoplasmic reticulum.