( Therefore ( , ( ( ( ( lipase , ) ( ( the enzyme ) ( which ( ( breaks down ) lipids ) ) ) ) , ) ( ( needs ( to ( have ( ( an ( active site ) ) ( ( to which ) ( ( a ( hydrophobic substrate ) ) binds ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Therefore)) (, ,) (NP (NP (NN lipase)) (, ,) (NP (NP (DT the) (NN enzyme)) (SBAR (WHNP (WDT which)) (S (VP (VBZ breaks) (PRT (RP down)) (NP (NNS lipids)))))) (, ,)) (VP (VBZ needs) (S (VP (TO to) (VP (VB have) (NP (NP (DT an) (JJ active) (NN site)) (SBAR (WHPP (TO to) (WHNP (WDT which))) (S (NP (DT a) (JJ hydrophobic) (NN substrate)) (VP (VBZ binds))))))))) (. .)))
Therefore, lipase, the enzyme which breaks down lipids, needs to have an active site to which a hydrophobic substrate binds.
(ROOT (S (NP (NNS Lipids)) (VP (VBP are) (VP (VBN broken) (PRT (RP down)) (PP (IN by) (NP (NNS lipases))))) (. .)))