( ( ( So basically ) ( what happens ) ) ( ( is ( that ( ( ( the ( light reactions ) ) ( on ( the thylakoid ) ) ) ( membrane ( you ( 've ( got ( ( special molecules ) ( that ( can ( absorb light ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (RB So) (RB basically)) (SBAR (WHNP (WP what)) (S (VP (VBZ happens))))) (VP (VBZ is) (SBAR (IN that) (S (NP (NP (DT the) (JJ light) (NNS reactions)) (PP (IN on) (NP (DT the) (NN thylakoid)))) (VP (VBD membrane) (SBAR (S (NP (PRP you)) (VP (VBP 've) (VP (VBN got) (NP (NP (JJ special) (NNS molecules)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB absorb) (NP (NN light))))))))))))))) (. .)))
So basically what happens is that the light reactions on the thylakoid membrane you've got special molecules that can absorb light.
(ROOT (S (NP (DT The) (JJ light) (NNS reactions)) (VP (VBP take) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (NN thylakoid))))) (. .)))