Question

Which of the following remains in continuation with endoplasmic reticulum?
(a)Golgi body
(b)Nuclear wall
(c)Mitochondria
(d)Cell wall

Answer 1

Hint: The cell organelles that take part in the production and distribution of proteins in a cell are together known as endomembrane systems. This system has a definite process and structure to carry out production.

Complete answer:
The endoplasmic reticulum remains in continuation with the outer Nuclear wall. It is because when a cell makes proteins, it transcribes mRNA from the DNA located inside the nucleus. The mRNA that is made is then Carried out of the nucleus into the RER (rough endoplasmic reticulum). There, it binds with ribosomes and makes polypeptides.

Additional Information: Let us look at the process in details:
The information that is required to make a protein inside the cell is present inside the cell's DNA. During this process, a copy of DNA is produced i.e. called mRNA and it is transported to the ribosome through RER that remains in continuous contact with the outer nuclear membrane. Ribosomes then read the information in the mRNA and assemble amino acids into protein.
Depending on the usage of the proteins, it stays or goes outside the cell. If the user is inside the cytoplasm then it stays there in a free-floating state. If the protein is targeted to the lysosome it becomes a component of the plasma membrane. If its usage is outside of the cell, it will be carried in a vesicle to the cis face of the Golgi body for modification. After its final modification, it exits through the trans face and gets ejected with the help of a vesicle.
So, the correct answer is ‘Nuclear wall’.

Note: The reason behind the nuclear wall to be in continuous connection with the endoplasmic reticulum is the need for mRNA from the DNA present inside the nucleus. The other organelles in the endomembrane system are connected directly. Instead, vesicles carry out the transportation from one part to another inside the cytoplasm.
Here’s a diagram of the endoplasmic reticulum and the nuclear wall-