( ( ( ( The absence ) ( of ( membrane-bound organelles ) ) ) ( in prokaryotes ) ) . )
(ROOT (NP (NP (DT The) (NN absence)) (PP (IN of) (NP (JJ membrane-bound) (NNS organelles))) (PP (IN in) (NP (NNS prokaryotes))) (. .)))
The absence of membrane-bound organelles in prokaryotes.
(ROOT (S (NP (NP (JJ Prokaryotic) (NNS cells) (POS ')) (NNS organelles)) (ADVP (RB because) (RB not)) (VP (VBD membrane-bound)) (. .)))