Question

Which of these actions occur(s) commonly at a nuclear pore complex?

Choose one or more:
A. Nuclear import receptors enter from the cytosol.
B. Nuclear import receptors are exported to the cytosol.
C. Proteins with a nuclear localization signal enter at the same time that proteins with a nuclear export signal exit.
D. mRNA molecules are exported to the cytosol.
E. Protein complexes diffuse into the nucleus.
F. Small water-soluble molecules are selectively transported into the nucleus.

Answer 1

At a nuclear pore complex, nuclear import receptors enter from the cytosol, proteins with a nuclear localization signal enter while proteins with a nuclear export signal exit, and mRNA molecules are exported to the cytosol.

Step-by-step explanation:

The actions that commonly occur at a nuclear pore complex include:

• A. Nuclear import receptors enter from the cytosol. Nuclear import receptors are proteins that bind to cargo molecules containing nuclear localization signals (NLS) and facilitate their transport into the nucleus.
• B. Nuclear import receptors are exported to the cytosol. After delivering their cargo to the nucleus, nuclear import receptors are recycled and exported back to the cytosol for further use.
• C. Proteins with a nuclear localization signal enter at the same time that proteins with a nuclear export signal exit. The nuclear pore complex allows for the simultaneous bidirectional transport of molecules by recognizing specific signals.
• D. mRNA molecules are exported to the cytosol.
• E. Protein complexes diffuse into the nucleus.
• F. Small water-soluble molecules are selectively transported into the nucleus.