Question

The nuclear envelope functions as a

A)The nuclear envelope functions as a means of sequestering many of the mRNA processing activities from the cytosol.

B) means of localization of the chromosomes within the cell.

C) selective barrier that separates nuclear and cytoplasmic constituents, localizes chromosomes within the cell, and sequesters many of the mRNA processing activities from the cytosol.

D) means of separating nuclear and cytoplasmic constituents. selective barrier, allowing certain substances in or out.

Answer 1

Option C is the correct answer. Nuclear membrane (also known as nuclear envelope) is outer bilayer covering of nucleus which separates nuclear and cytoplasmic constituents. It also contains pores (nuclear pores) which allows some selective proteins to move in and out of the nucleus and therefore it is selective barrier. The envelope contains multiple proteins that keep the chromosomes in place within the nucleus. Nuclear membrane contain hnRNPA1 protein which act as a shuttle between nuclear and cytoplasmic compartment and allow only mature pre mRNA to go to the cytoplasm.