( ( ( ( ( ( ( Stretched out ) ( in ( a ( straight line ) ) ) ) ( , ( ( ( the DNA ) ( in ( a ( single cell ) ) ) ) ( would ( have ( ( a length ) ( of ( ( about two ) meters ) ) ) ) ) ) ) ) , ) but ) ( ( at times ) ( ( ( the ( combined length ) ) ( of ( ( the ( 46 chromosomes ) ) ( in ( the ( cell nucleus ) ) ) ) ) ) ( is ( ( a millionth ) ( of this ) ) ) ) ) ) . )
(ROOT (S (S (S (VP (VBN Stretched) (PRT (RP out)) (PP (IN in) (NP (DT a) (JJ straight) (NN line))))) (, ,) (NP (NP (DT the) (NN DNA)) (PP (IN in) (NP (DT a) (JJ single) (NN cell)))) (VP (MD would) (VP (VB have) (NP (NP (DT a) (NN length)) (PP (IN of) (NP (QP (RB about) (CD two)) (NNS meters))))))) (, ,) (CC but) (S (PP (IN at) (NP (NNS times))) (NP (NP (DT the) (JJ combined) (NN length)) (PP (IN of) (NP (NP (DT the) (CD 46) (NNS chromosomes)) (PP (IN in) (NP (DT the) (NN cell) (NN nucleus)))))) (VP (VBZ is) (NP (NP (DT a) (NN millionth)) (PP (IN of) (NP (DT this)))))) (. .)))
Stretched out in a straight line, the DNA in a single cell would have a length of about two meters, but at times the combined length of the 46 chromosomes in the cell nucleus is a millionth of this.
(ROOT (S (SBAR (IN If) (S (NP (NP (DT the) (NN dna)) (PP (IN from) (NP (NP (DT all) (CD 46) (NNS chromosomes)) (PP (IN in) (NP (DT a) (JJ human) (NN cell) (NN nucleus)))))) (VP (VBD was) (VP (VBN laid) (PRT (RP out)) (NP (NN end)) (S (VP (TO to) (VP (VB end)))))))) (, ,) (NP (PRP it)) (VP (MD would) (VP (VB measure) (ADVP (NP (QP (RB approximately) (CD two)) (NNS meters)) (RB long)))) (. .)))
If the dna from all 46 chromosomes in a human cell nucleus was laid out end to end, it would measure approximately two meters long.