( ( Metabolic requirements ) ( also ( ( ( impose limits ) ( on ( ( the size ) ( that ( is ( practical ( for ( a ( single cell ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (JJ Metabolic) (NNS requirements)) (ADVP (RB also)) (VP (VB impose) (NP (NNS limits)) (PP (IN on) (NP (NP (DT the) (NN size)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (JJ practical) (PP (IN for) (NP (DT a) (JJ single) (NN cell)))))))))) (. .)))
Metabolic requirements also impose limits on the size that is practical for a single cell.
(ROOT (S (NP (NP (DT The) (NNS logistics)) (PP (IN of) (S (VP (VBG carrying) (PRT (RP out)) (NP (JJ cellular) (NN metabolism) (NNS sets)))))) (VP (VBZ limits) (PP (IN on) (NP (NP (DT the) (NN size)) (PP (IN of) (NP (DT the) (NN cell)))))) (. .)))