32 



CARBOHYDRATES 



CH2OPO3H2 



HoNptlf^ 



OH 

 OH 



■^ 



G-LUGOSE-6- 

 PHOSPHATE 



CH2OPO3H2 



OH 



6-PHOSPHOG-LUCONO- 

 LACTONE 

 .-^OH 



T 



— ) CO. 



5-DEHYDRO- 

 QUINIC ACID 







CHoOH 



HC: 



hcoh\ 



I 



HCOHy 



I 

 HC 

 I 

 CH2OPO3H2 



D-RIBOSE-5- 

 PHOSPHATE 



HOC 

 I 



II I C 

 HoWoH 



T 



0=COH 



COOH "0^" 



HCOH 



HC=0 



I 

 HCOH 



I 



C=0 

 I 

 HCH 

 I 



HOCH 



I 



HCOH 



I 

 HCOH 



I 



CHjOPOjHj 



SEDOHEPTULOSE- 

 7-PHOSPHATE 



CHgOPOjHj 



CH,OH 

 I 2 



c=o ^ 



HCOH 



I 

 HCOH 



I 



CH2OPO3H2 



D-RIBULOSE- 

 5 -PHOSPHATE 



4^ 



CH«OH 

 I 2 

 C=0 

 I 

 HOCH 

 I 

 HCOH 

 I 



CH^P(^2- 



D-XYLULOSE- 

 5-PHOSPHATE 



CH2OPO3H2 



c=o 



> I 



HCOH 



I 

 HCOH 



I 



CH2OPO3H2 



D-RIBUL0SE-L5- 

 DIPHOSPHATE 



r 



CO, 



HOC=0 (2 , 

 I MOL.) 



HCOH 



in^OPOgHj 



3-PH0SPH0&LY- 

 ACID 



<- 



A 



HOC=0 



CHjOPO^Hj 



2-KET0-3-DE0XY- 



7-PHOSPHO-D- 

 &LUCOHEPTONIC 



ACID 



HC=0 



* HCOH 

 I 

 HCOH 

 I 

 I CH«OPOaH« 



COPO3H2 ^32 



CH2 



D-ERYTHROSE-4- 



2-PHOSPHO- 

 ENOLPYRUVIC 



D-G-LYCERALDE- 

 HYDE-3-PH0SPHATE 



FIGURE 2-8: PENTOSE PHOSPHATE CYCLE AND PHOTOSYNTHETIC 

 CARBON DIOXIDE FIXATION 



