( ( Prokaryotic cells ) ( ( ( ( lack ( a ( membrane-bound nucleus ) ) ) , ) ( ( whereas , ) ( ( eukaryotic cells ) ( have ( a ( membrane-bound nucleus ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Prokaryotic) (NNS cells)) (VP (VBP lack) (NP (DT a) (JJ membrane-bound) (NN nucleus)) (, ,) (SBAR (IN whereas) (, ,) (S (NP (JJ eukaryotic) (NNS cells)) (VP (VBP have) (NP (DT a) (JJ membrane-bound) (NN nucleus)))))) (. .)))
Prokaryotic cells lack a membrane-bound nucleus, whereas, eukaryotic cells have a membrane-bound nucleus.
(ROOT (S (NP (NP (DT The) (JJ main) (NN difference)) (PP (IN between) (NP (ADJP (JJ eukaryotic) (CC and) (JJ prokaryotic)) (NNS cells)))) (VP (VBZ is) (SBAR (IN that) (S (NP (JJ eukaryotic) (NNS cells)) (VP (VBP have) (NP (DT a) (NN nucleus)))))) (. .)))