Question: 144: Which of the following statements with respect to Endoplasmic Reticulum is incorrect?
(1) In prokaryotes only RER are present
(2) SER are the sites for lipid synthesis
(3) RER has ribosomes attached to ER
(4) SER is devoid of ribosomes
Answer: Option (1)
Explanation:
Endoplasmic reticulum is a membrane-bound organelle present only in eukaryotic cells.
Prokaryotic cells lack membrane-bound organelles, including endoplasmic reticulum.
Therefore, the statement that in prokaryotes only rough endoplasmic reticulum is present is incorrect.
Smooth endoplasmic reticulum is involved in lipid and steroid synthesis.
Rough endoplasmic reticulum has ribosomes attached to its surface, which helps in protein synthesis.
Smooth endoplasmic reticulum does not have ribosomes attached and is therefore devoid of ribosomes.