Question

Question 2 As part of the sequential electron transfer process in photosystem 2, plastoquinone, shown, accepts two electrons and two hydrogen ions when it forms plastoquinol. Subsequently plastoquinol transfers an electron to the cytochrome f heme group in the cyctochrome b/f complex H₂C H3C Y R i) Explain the sequential two-step conversion of plastoquinone to plastoquinol with the aid of an annotated diagram showing both steps. ii) Draw the structure of the core of the cytochrome f heme group (ignore functionalization of the periphery) and explain how it accepts an electron from plastoquinol.

Answer 1

City re 47-e Phufronunal Phastaceminune Perstoaunone plaotoguinol plotoauinone ir aducel to plootoguinol upon one-electon educhon in prasene aHtion. The plstoquinaisfonhar educed t in presenle sf a Ht jon to fo plastrundl The-electos # C B 14 CtY Citr S-probei'n The Core of cgtachromef he iTon atom Can Change t axidahon Stare befween Ft and Fet Thu tacts ao one- electon CariY plastaumel frst tanofe ane. eleehor to rSfi prrorein at a, se t the

Limen, Then the ren-sufurpotein Hantfers f. Then Cyto chromt f fanfers to plantoyamh ane eleifon to the elecho