90S preribosome assembly
The aggregation, arrangement and bonding together of proteins and RNA molecules to form a 90S preribosome. The 90S preribosome represents the complex that forms on the primary rRNA transcript before it splits into the small subunit and large subunit portions.
GO:0022618
protein-RNA complex assembly
is_a
GO:0042256
cytosolic ribosome assembly
part_of