( ( A prokaryote ) ( ( is ( ( ( ( ( a ( ( simple ( , ( mostly single-celled ) ) ) ( ( -LRB- ( unicellular -RRB- ) ) organism ) ) ) ( that ( lacks ( a nucleus ) ) ) ) , ) or ) ( any ( other ( membrane-bound organelle ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN prokaryote)) (VP (VBZ is) (NP (NP (NP (DT a) (ADJP (JJ simple) (, ,) (RB mostly) (JJ single-celled)) (PRN (-LRB- -LRB-) (NP (NN unicellular)) (-RRB- -RRB-)) (NN organism)) (SBAR (WHNP (WDT that)) (S (VP (VBZ lacks) (NP (DT a) (NN nucleus)))))) (, ,) (CC or) (NP (DT any) (JJ other) (JJ membrane-bound) (NN organelle)))) (. .)))
A prokaryote is a simple, mostly single-celled (unicellular) organism that lacks a nucleus, or any other membrane-bound organelle.
(ROOT (S (NP (NP (JJ Prokaryotic) (NNS cells) (POS ')) (NNS organelles)) (ADVP (RB because) (RB not)) (VP (VBD membrane-bound)) (. .)))