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Unformatted text preview: roduc e ADP and NADP+, res pec tiv ely , whic h are returned to the light reac tions s o that more ATP and
NADPH c an be formed. Part C Redox reactions of photosynthesis
In photos y nthes is , a redox c ompound that is produc ed in the light reac tions is required to driv e other redox reac tions in the Calv in c y c le, as s hown in
this figure along with other c omponents of photos y nthes is . se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 28/41 13- 10- 13 Cha pte r 10 Drag the term s to the appropriate blanks to com plete the following sentences sum m ariz ing the redox reactions of photosynthesis. Term s
m ay be used once, m ore than once, or not at all. Hin t 1. Review of redox reactions and terminology
Under mos t c irc ums tanc es , redox reac tions oc c ur in pairs . In one reac tion, the elec tron donor is ox idiz ed (it los es elec trons ). In the other
reac tion, the elec tron ac c eptor is reduc ed (it gains the elec trons los t by the firs t c ompound). Thes e two reac tions oc c ur s imultaneous ly . A
generic redox reac tion s howing the trans fer of two elec trons is illus trated here. Note that c ompounds A and B eac h ex is t in two forms : One form is reduc ed (it c arries the ex tra elec trons ); the other form is ox idiz ed (it does
not c arry the ex tra elec trons ). In the reac tions s hown here, the elec tron donor is the reduc ed form of c ompound A, and the elec tron ac c eptor is
the ox idiz ed form of c ompound B. Hin t 2. How is redox energy transferred from the light reactions to the Calvin cycle?
In the light reac tions , the energy of s unlight is c onv erted to redox energy . This redox energy is trans ferred to the Calv in c y c le in the form of a
reduc tant that prov ides elec trons for reduc ing other c ompounds .
Which of the following m olecules shuttles electrons from the light reactions to the Calvin cycle?
NADP+ Hin t 3. What is the original electron donor...
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- Spring '14