Multiple Choice
Import of molecules into the nucleus requires the use of importin and RAN-GTP. When RAN-GTP binds to importin, what happens to the molecule?
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5. DNA to RNA to Protein
mRNA Export and Nuclear Structures
Multiple Choice
In eukaryotic cells, where does ribosome assembly primarily occur before ribosomal subunits are exported to the cytoplasm?
A
The nuclear pore complex
B
The cytosol
C
The rough endoplasmic reticulum
D
The nucleolus
Verified step by step guidance1
Understand that ribosome assembly in eukaryotic cells involves the production and initial assembly of ribosomal RNA (rRNA) and ribosomal proteins.
Recall that ribosomal RNA is transcribed and processed in a specific region within the nucleus called the nucleolus.
Recognize that the nucleolus is a dense structure inside the nucleus where ribosomal subunits are assembled from rRNA and ribosomal proteins imported from the cytoplasm.
Note that after assembly in the nucleolus, the ribosomal subunits are exported through the nuclear pore complex to the cytoplasm for final assembly into functional ribosomes.
Conclude that the primary site of ribosome assembly before export to the cytoplasm is the nucleolus, not the nuclear pore complex, cytosol, or rough endoplasmic reticulum.
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