( ( Prokaryote ( ( An ( ( organism or ) cell ) ) ( that ( lacks ( a ( membrane-bounded nucleus ) ) ) ) ) ) . )
(ROOT (S (VP (VB Prokaryote) (NP (NP (DT An) (NN organism) (CC or) (NN cell)) (SBAR (WHNP (WDT that)) (S (VP (VBZ lacks) (NP (DT a) (JJ membrane-bounded) (NN nucleus))))))) (. .)))
Prokaryote An organism or cell that lacks a membrane-bounded nucleus.
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBP are) (NP (NP (JJ single-celled) (CC or) (JJ colonial) (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VBP do) (RB not) (VP (VB have) (VP (VBN membranebound) (NP (NNS nuclei))))))))) (. .)))