( Ribosomes ( ( are ( composed ( of ( ( ( two ( rRNA subunits ) ) and ) ( other ( catalytic proteins ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Ribosomes)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NP (CD two) (NN rRNA) (NNS subunits)) (CC and) (NP (JJ other) (JJ catalytic) (NNS proteins)))))) (. .)))
Ribosomes are composed of two rRNA subunits and other catalytic proteins.
(ROOT (S (NP (DT A) (NN ribosome)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (NNS elements)) (, ,) (NP (NN rrna)) (CC and) (NP (NNS proteins))))) (. .)))
A ribosome consists of two elements, rrna and proteins.