quick bio nitpicking (rRNA or ribosome) in destroyer

[wall1two]

2011 destroyer, bio number 53.

The nucleolus is the site of ribosome assembly.-true

well i know rRNA is made in the nucleolus but i thought the rRNA subunits (30 and 50) that are made in the nucleolus are not considered a ribosome until they bind and sandwich mRNA . I just want to make sure i'm not caught with a technicality on the test. (just looked over the 2009 paid-sample ada test and jeeze)

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[Kahr]

You're correct, ribosomal sub unit assembly occurs in the nucleolus, while ribosome assembly occurs in the cytoplasm from these subunits, though they assemble without necessarily being involved with mRNA, source Campbell's 8th:

These subunits then exit the nucleus through the nuclear pores to the cytoplasm, where a large and a small subunit can assemble into a ribosome.