Export of RNAs from the nucleus occurs primarily by
A) passive diffusion through nuclear pore complexes.
B) cotranscriptional insertion through protein pores of the nuclear envelope membrane.
C) selective transport through nuclear pore complexes.
D) release from the nucleus when it breaks down at mitosis.

Question

Quizplus · Accepted Answer

Export of RNAs from the nucleus occurs primarily by selective transport through nuclear pore complexes. These complexes are responsible for regulating the passage of molecules between the nucleus and cytoplasm, allowing only certain molecules (such as RNAs) to pass through by active transport. Passive diffusion is not an efficient mechanism for exporting large molecules like RNAs, and cotranscriptional insertion through protein pores of the nuclear envelope membrane is not an established mechanism for RNA export. Release of RNAs during mitosis is a result of nuclear breakdown, but this is not a primary mechanism for RNA export.

Export of RNAs from the Nucleus Occurs Primarily by