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Unformatted text preview: ants (elec tron donors ). What is the role of the reduced PS I prim ary electron acceptor in the light reactions? ANSWER: ox idation of the elec tron trans port c hain between the photos y s tems reduc tion of NADP+ to NADPH reduc tion of the elec tron trans port c hain between the photos y s tems ox idation of water to O2 Hin t 4. Electron movement between the two photosystems Photos y s tem I and Photos y s tem II were named in the order they were dis c ov ered, not in the order in whic h they func tion in elec tron trans port. Elec trons flow from PS II to PS I. Cons ider what this means in terms of the roles of PS II and PS I in either the reduc tion or ox idation of the elec tron trans port c hain between the photos y s tems . ANSWER: se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 15/41 13- 10- 13 Cha pte r 10 Correct The k ey func tion of eac h of the two photos y s tems is to abs orb light and c onv ert the energy of the abs orbed light into redox energy , whic h driv es elec tron trans port. In PS II (the firs t photos y s tem in the s equenc e), P680 is ox idiz ed (whic h in turn ox idiz es water), and the PS II primary elec tron ac c eptor is reduc ed (whic h in turn reduc es the elec tron trans port c hain between the photos y s tems ). In PS I, the PS I primary elec tron ac c eptor is reduc ed (whic h in turn reduc es other c ompounds that ultimately reduc e NADP+ to NADPH), and P700 is ox idiz ed (whic h in turn ox idiz es the elec tron trans port c hain between the photos y s tems ). Part B ­ Energetics of electron transport This diagram s hows the bas ic pattern of elec tron trans port through the four major protein c omplex es in the thy lak oid membrane of a c hloroplas t. se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 16/41 13- 10- 13 Cha pte r 10 For each step of photosynthetic electron flow from water to NADP+, drag the appropriate label to indicate whether or not that st...
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