Protein 



Amino Acids 



+ NH, 



^3- (Phos) 



(from ATP) 



Diphosphoglyceric 

 Acid 



H 

 I 



H-C-0-(Phos^ 



H-C-OH 

 I 



C-OH 

 II 







+ 

 co 2 



H 



H — C — — (Phos) 



I ^-^ 



H-C-OH 



C-0-(Phos) 



II v — ' 







PGA 



Phosphoglyceric 

 Acid 



Fat 



Fatty 

 Acids 



•Glycerol 



Unstable 6-carbon inter- 

 mediary; exact structure 

 not known 



T 



CO 5 



~E'|+H + (from 



TPN-H, 



H 

 H— C — — (Phos) 



H-C-OH 



I 

 H-C = 



Triose Phosphate 

 T 



H 



I 



H-C-OH 



I 



c=o 

 I 



H-C-OH 

 I 



H-C-OH 



H— C — — (Phos) 

 H 



Ribuiose Monophosphate 



H 



H-C-0-(Pho?) 

 I v — ' 



C=0 



I 



H-C-OH 



I 

 H-C-OH 



H— C— — (Phos 



H 



r~ 



Starch 



t 



Glucose 

 Phosphate 



I 



Fructose 

 Monophosphate 



T 



Fructose 

 Diphosphate 

 (see Fig. 8-6) 



m 



'MS S 

 + 



Phos) from ATP 



Ribuiose Diphosphate 



Fig. 9-6. Pathways of carbon assimilation in green plant cells; abbreviated version of the Calvin cycle (modi- 

 fled from Bassham). The major agency for the fixation of CO., is ribuiose diphosphate (lower right). Note that 

 PGA the first stable product that accumulates subsequent to CO., fixation, is utilized in several ways. Part of it 

 is recycled back to replenish ribuiose diphosphate, the CO., -fixation agency; but part provides material for the 

 synthesis not only of carbohydrate (starch), but also of proteins and fats. Also note that the energy, which drives 

 the cycle, comes from ATP and TPN-H.,, previously generated by means of light energy. 



