( Prokaryotes ( ( are ( ( unicellular organisms ) ( that ( ( ( ( do not ) ( have ( membrane-bound organelles ) ) ) and ) ( lack ( a ( ( structurally distinct ) nucleus ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBP are) (NP (NP (NN unicellular) (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP do) (RB not) (VP (VB have) (NP (JJ membrane-bound) (NNS organelles)))) (CC and) (VP (VBP lack) (NP (DT a) (ADJP (RB structurally) (JJ distinct)) (NN nucleus)))))))) (. .)))
Prokaryotes are unicellular organisms that do not have membrane-bound organelles and lack a structurally distinct nucleus.
(ROOT (S (NP (NNS Prokaryotes)) (VP (VBP are) (NP (NN unicellular) (NNS organisms)) (SBAR (IN that) (S (NP (NN lack) (NNS organelles)) (VP (VBN surrounded) (PP (IN by) (NP (NNS membranes))))))) (. .)))
Prokaryotes are unicellular organisms that lack organelles surrounded by membranes.