AP Biologymediummcq1 pt
What does the nucleolus do?
A.Assembles ribosomal subunits
B.Synthesizes ATP
C.Digests old organelles
D.Packages lipids
Explanation
Core Concept
The nucleolus is the principal site where most rRNA is transcribed and processed and where rRNA associates with imported ribosomal proteins to form early ribosomal subunit particles. These particles are exported through nuclear pores and complete maturation in the cytoplasm. The wording 'most rRNA' avoids implying that every rRNA species is transcribed in the nucleolus.
Correct Answer
AAssembles ribosomal subunits
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