Biology / Unit 2 Bio 0267 short lesson, about 20 seconds
The Nucleolus
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The idea
The nucleolus is a darkly staining region within the nucleus where ribosomal RNA and protein assemble into ribosomal subunits.
In practice
Those assembled subunits then pass out through the nuclear envelope's pores into the cytoplasm, where they complete a functioning ribosome.
Where people slip
The nucleolus is a region within the nucleus, not a separate membrane-bound organelle of its own.
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