Multiple Choice
In eukaryotic cells, where does ribosome assembly primarily occur before ribosomal subunits are exported to the cytoplasm?
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5. DNA to RNA to Protein
mRNA Export and Nuclear Structures
Multiple Choice
In the context of mRNA export and nuclear structures, which cellular structure is responsible for assembling ribosomal subunits?
A
Nuclear pore complex
B
Rough endoplasmic reticulum
C
Golgi apparatus
D
Nucleolus
Verified step by step guidance1
Understand the role of the nucleolus: It is a specialized region within the nucleus where ribosomal RNA (rRNA) is transcribed and ribosomal subunits are assembled.
Recall that ribosomal subunits consist of rRNA and proteins, and their assembly begins in the nucleolus before being exported to the cytoplasm.
Differentiate the nucleolus from other cellular structures: The nuclear pore complex facilitates transport between nucleus and cytoplasm, the rough endoplasmic reticulum is involved in protein synthesis, and the Golgi apparatus modifies and sorts proteins.
Recognize that the nucleolus is not a membrane-bound organelle but a dense region within the nucleus dedicated to ribosome production.
Conclude that the nucleolus is the correct cellular structure responsible for assembling ribosomal subunits.
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