The two dissimilar sized ribonucleoprotein complexes that comprise a RIBOSOME - the large ribosomal subunit and the small ribosomal subunit. The eukaryotic 80S ribosome is composed of a 60S large subunit and a 40S small subunit. The bacterial 70S ribosome is composed of a 50S large subunit and a 30S small subunit.

Synonyms: Subunits, Ribosome, Ribosome Subunit, Subunits, Ribosomal, Ribosomal Subunit, Ribosomal Subunits, Subunit, Ribosome, Ribosome Subunits, Subunit, Ribosomal