CHLOROPHYLL AND ENERGY 



CH O 



HC C - C 



NH, 



HC CH 



N nicotinamide 



I 



CH 



HC 





183 

 NH2 



N - C N 



C CH 



\ ^ 

 N 

 adenine 



HOCH O 



OH OH 



CH 



/ \ 

 O HCOH 



HOC 



-C-CHo-O-P-O-P-O-CHo-C 



-COH 



I I 



H H 



ribose 



00 H H 



pyrophosphoric acid ribose 



Diphosphopyridine nucleotide (DPN) 



A third phosphoric acid may be attached to the adenyUc 

 ribose and we have triphosphopyridine nucleotide or TPN. 



N - 



CH 



O 



I 



HC - O - PO2H2 



I 

 -COH 



- CH2 - C — 



I 

 H H 



Triphosphopyridine nucleotide (TPN) 



DPN specializes in the transport of hydrogen even more 

 than in the transport of energy and it can, according to 

 circumstances, be reduced and become DPNH 2, or be oxidized 

 and become again DPN. 



