Question

Which of the following statements with respect to Endoplasmic Reticulum is incorrect?

• A. RER has ribosomes attached to ER
• B. SER is devoid of ribosomes
• C. In prokaryotes only RER are present
• D. SER are the sites for lipid synthesis

Answer 1

The Correct Option is C

To determine the incorrect statement about the Endoplasmic Reticulum (ER), let's evaluate each option:

• RER has ribosomes attached to ER: This statement is correct. The Rough Endoplasmic Reticulum (RER) is characterized by having ribosomes on its cytoplasmic surface, which gives it a "rough" appearance under a microscope.
• SER is devoid of ribosomes: This statement is correct. The Smooth Endoplasmic Reticulum (SER) lacks ribosomes, making its surface appear smooth.
• In prokaryotes only RER are present: This statement is incorrect. Prokaryotes do not have an Endoplasmic Reticulum. Both RER and SER are components of eukaryotic cells, not found in prokaryotes such as bacteria.
• SER are the sites for lipid synthesis: This statement is correct. The Smooth Endoplasmic Reticulum is involved in the synthesis of lipids and steroid hormones.

Thus, the statement that is incorrect regarding the Endoplasmic Reticulum is: In prokaryotes only RER are present.