Question

Assertion: The endoplasmic reticulum which lacks ribosomes is called smooth
endoplasmic reticulum (SER)
Reason: SER is mainly involved in protein synthesis.
A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B Both Assertion and Reason are correct but Reason is not the correct explanation for
Assertion
C Assertion is correct but Reason is incorrect
D Both Assertion and Reason are incorrect

Answer 1

Hint The endoplasmic reticulum is the eukaryotic cell's transportation system, as well as a host of other activities such as protein folding. Rough endoplasmic reticulum and smooth endoplasmic reticulum are the two subunits that make up this sort of organelle.

Complete step by step answer:
In biology, the endoplasmic reticulum (ER) is a continuous membrane structure that creates a series of flattened sacs within the cytoplasm of eukaryotic cells and performs a variety of tasks, including protein synthesis, folding, modification, and transport.
Smooth endoplasmic reticulum (SER) and rough endoplasmic reticulum (RER) are two functionally different types of ER (RER). The presence of protein-synthesizing particles termed ribosomes connected to the RER's outer surface distinguishes the two morphologically.
The SER, which is made up of a meshwork of tiny tubular membrane vesicles, has a variety of activities that differ from cell to cell, one of which is the creation of phospholipids and cholesterol, which are key components of the plasma and internal membranes.
SER is involved in fat synthesis and the development of spherosomes within adipose tissue cells. In liver cells, glycogen synthesis and glycogenolysis (hydrolysis of glycogen) occur, as do the production of sterols and steroid hormones in testis and ovary interstitial cells, and the generation of vision pigments from vitamin A in retinal cells.

As a result, the right answer is 'Assertion is correct, but Reason is wrong.' So, option C is correct.

Note: The RER is made up of a collection of flattened sacs that are linked. It is best investigated in secretory cells that specialise in these roles since it plays a key role in protein and glycoprotein synthesis and export.