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that the reac tions oc c ur in the rev ers e direc tion. In gly c oly s is , for eac h molec ule of G3P that is c onv erted to PGA, 1 Pi is tak en up, 1 NAD+ is
c onv erted to NADH, and 1 ADP is c onv erted to ATP. Cons ider the analogous reac tions in the Calv in c y c le to help y ou label targets (a), (b), and
(c ). Hin t 2. How many Pi are released in Phase 3?
In the firs t part of Phas e 3, the G3P molec ules left ov er from Phas e 2 are c onv erted to R5P with the releas e of Pi.
For the net conversion of 3 m olecules of CO2 into 1 m olecule of G3P by the Calvin cycle, which of the following equations correctly
accounts for the inputs and outputs of phosphate groups in Phase 3?
5 P (in G3P) → 3 P (in R5P) + 2 Pi
6 P (in G3P) → 3 P (in R5P) + 3 Pi
15 P (in G3P) → 12 P (in R5P) + 3 Pi
3 P (in G3P) → 2 P (in R5P) + 1 Pi Hin t 3. Can you trace the net movement of phosphate groups in the Calvin cycle?
Phos phates are c ons erv ed in the Calv in c y c le: For eac h turn of the Calv in c y c le, the number of phos phate groups that enter the c y c le from
ATP is equal to the number of phos phate groups that are output from the c y c le.
Phosphate is output from the Calvin cycle in all of the following ways except
the output of Pi in Phas e 2.
the output of 1 G3P per turn of the Calv in c y c le.
the output of 5 G3P from Phas e 2 to Phas e 3 of the Calv in c y c le.
the output of Pi in Phas e 3. ANSWER: se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 34/41 13- 10- 13 Cha pte r 10 Correct
The Calv in c y c le requires a total of 9 ATP and 6 NADPH molec ules per G3P output from the c y c le (per 3 CO2 fix ed).
In Phas e 2, s ix of the ATP and all of the NADPH are us ed in Phas e 2 to c onv ert 6 molec ules of PGA to 6 molec ules of G3P. Six
phos phate groups are als o releas ed in Phas e 2 (deriv ed from the 6 ATP us ed).
In the firs t part of Phas e 3, 5 molec ules of G3P (1 phos phate group eac h) are...
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This document was uploaded on 02/17/2014 for the course BIOCHEMIST 2550 at Ohio State.
- Spring '14