( ( ( Each ( DNA molecule ) ) ( with ( ( it 's ) proteins ) ) ) ( ( is ( a chromosome ) ) . ) )
(ROOT (S (NP (NP (DT Each) (NN DNA) (NN molecule)) (PP (IN with) (NP (NP (PRP it) (POS 's)) (NNS proteins)))) (VP (VBZ is) (NP (DT a) (NN chromosome))) (. .)))
Each DNA molecule with it's proteins is a chromosome.
(ROOT (S (NP (NNP Dna)) (VP (VBZ encodes) (NP (NP (NNS instructions)) (PP (IN for) (NP (NNS proteins) (NNS molecules))))) (. .)))