( ( Describe ( ( ( the mitochondrion ) and ) ( ( its role ) ( in ( aerobic respiration ) ) ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (DT the) (NN mitochondrion)) (CC and) (NP (NP (PRP$ its) (NN role)) (PP (IN in) (NP (JJ aerobic) (NN respiration)))))) (. .)))
Describe the mitochondrion and its role in aerobic respiration.
(ROOT (S (NP (NP (DT The) (NN structure)) (PP (IN of) (NP (NN mitochondrion)))) (VP (VBZ plays) (NP (NP (DT an) (JJ important) (NN role)) (PP (IN in) (NP (JJ aerobic) (NN respiration))))) (. .)))