( ( Biological molecules ) ( ( ( are often ) ( ( referred to ) ( as ( ( macromolecules or ) biopolymers ) ) ) ) . ) )
(ROOT (S (NP (JJ Biological) (NNS molecules)) (VP (VBP are) (ADVP (RB often)) (VP (VBN referred) (S (VP (TO to))) (PP (IN as) (NP (NNS macromolecules) (CC or) (NNS biopolymers))))) (. .)))
Biological molecules are often referred to as macromolecules or biopolymers.
(ROOT (S (NP (DT Any) (JJ large) (NN molecule)) (VP (VBZ is) (VP (VBN referred) (PP (TO to) (NP (RB as) (DT a) (NN macromolecule))))) (. .)))