Question

Which does NOT normally occur at a nuclear pore complex?

(A) A protein complex is imported into the nucleus.
(B) A protein containing a nuclear localization signal enters the pore from the cytosol at the same time that a protein containing a nuclear export signal exits the pore from the nucleus.
(C) An mRNA molecule is exported to the cytosol.
(D) A nuclear import receptor is exported to the cytosol.
(E) All of the above are common occurrences.
(F) None of the above are common occurrences.

Answer 1

The correct answer is (D) A nuclear import receptor is exported to the cytosol.

Step-by-step explanation:

The correct answer is (D) A nuclear import receptor is exported to the cytosol.

An import receptor is responsible for transporting proteins from the cytosol into the nucleus, not exporting them. The nuclear pore complex allows for the transport of molecules like proteins and RNA between the nucleus and cytoplasm.

Therefore, all the other options normally occur at a nuclear pore complex.