Question Detail
Question
One of the following is NOT a subdomain of the Endoplasmic Reticulum: A. Nuclear envelope B. Smooth ER C. Mitochondrion-associated membrane D. ERGIC
Correct Answer
Option A is the correct answer.
Detailed Explanation
While the nuclear envelope is continuous with the rough ER, it is generally considered a distinct structure, not a subdomain of the ER itself. Smooth ER and Rough ER are the main subdomains. Mitochondrion-associated membranes (MAM) and the ERGIC are specialized regions or compartments closely linked to ER function.
Hint
One of these is a separate organelle that happens to be connected, not a part of the ER.