試題詳解

32. Which of the following about the cell nucleus and nuclear transport are correct?
(A) Nucleolus is the major protein synthesis site in the nucleus.
(B) Import into and export out of the cell nucleus require a nuclear localizing signal (NLS) and a nuclear export signal (NES), respectively.
(C) The cargo-importin complex is cotransported into the nucleus with a GTP-bound Ran. It is the GTP hydrolysis in the nucleus that changes the Ran to the GDP-bound state and releases the cargo into the nucleoplasm.
(D) The outer membrane of the nuclear envelope is continuous with the ER.
(E) All protein components in the nuclear pore complex (NPC) undergo constant turnover and most have a short half-life.