( ( The head ) ( ( is ( what ( ( ( contains ( the ( genetic material ) ) ) and ) ( is ( capped ( by ( ( ( the acrosome ) , ) ( which ( contains ( enzymes ( ( needed ( for ( the sperm ) ) ) ( to ( penetrate ( the egg ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN head)) (VP (VBZ is) (SBAR (WHNP (WP what)) (S (VP (VP (VBZ contains) (NP (DT the) (JJ genetic) (NN material))) (CC and) (VP (VBZ is) (ADJP (VBN capped) (PP (IN by) (NP (NP (DT the) (NN acrosome)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ contains) (NP (NP (NNS enzymes)) (VP (VBN needed) (PP (IN for) (NP (DT the) (NN sperm))) (S (VP (TO to) (VP (VB penetrate) (NP (DT the) (NN egg)))))))))))))))))) (. .)))
The head is what contains the genetic material and is capped by the acrosome, which contains enzymes needed for the sperm to penetrate the egg.
(ROOT (S (NP (NP (DT The) (`` ``) (NN head) ('' '')) (PP (IN of) (NP (DT the) (NN sperm)))) (VP (VBZ contains) (NP (DT the) (JJ genetic) (NN material))) (. .)))