( ( One ( oxygen molecule ) ) ( ( can ( bind ( to ( ( the ( ferrous iron ) ) ( of ( ( a ( heme molecule ) ) ( in ( each ( of ( ( the ( four chains ) ) ( of ( a ( hemoglobin molecule ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (CD One) (NN oxygen) (NN molecule)) (VP (MD can) (VP (VB bind) (PP (TO to) (NP (NP (DT the) (JJ ferrous) (NN iron)) (PP (IN of) (NP (NP (DT a) (JJ heme) (NN molecule)) (PP (IN in) (NP (NP (DT each)) (PP (IN of) (NP (NP (DT the) (CD four) (NNS chains)) (PP (IN of) (NP (DT a) (NN hemoglobin) (NN molecule))))))))))))) (. .)))
One oxygen molecule can bind to the ferrous iron of a heme molecule in each of the four chains of a hemoglobin molecule.
(ROOT (S (NP (NNP Hemoglobin)) (VP (VBZ is) (NP (NP (DT a) (NN carrier) (NN molecule)) (SBAR (WHNP (WDT that)) (S (VP (VBZ becomes) (ADJP (RBR less) (JJ effective) (PP (IN at) (NP (NP (VBG binding) (NN oxygen)) (PP (IN as) (NP (NN temperature) (NNS increases))))))))))) (. .)))