( Ribosomes ( ( are ( made ( of ( ( a ( large number ) ) ( of ( ( proteins and ) ( ribosomal ( RNA ( ( -LRB- ( rRNA -RRB- ) ) molecules ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Ribosomes)) (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NP (DT a) (JJ large) (NN number)) (PP (IN of) (NP (NP (NNS proteins)) (CC and) (NP (NNP ribosomal) (NNP RNA) (PRN (-LRB- -LRB-) (NP (NNP rRNA)) (-RRB- -RRB-)) (NNP molecules)))))))) (. .)))
Ribosomes are made of a large number of proteins and ribosomal RNA (rRNA) molecules.
(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.