( ( A gene ) ( ( is ( composed ( of ( ( DNA and ) protein ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN gene)) (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NN DNA) (CC and) (NN protein))))) (. .)))
A gene is composed of DNA and protein.
(ROOT (S (NP (NNS Genes)) (VP (VBP are) (VP (VBN composed) (PP (IN of) (NP (NN dna))))) (. .)))
Genes are composed of dna.