The Chemical Basis of Life 



13 



Leucine 



CH 3 CO— OH 



\ / 



CH— CH,— CH 



/ " \ 



CH 3 NH, 



Caprine 



GH 3 — CH 2 — CH 2 — CH 2 — CH 



CO— OH 



NE 



Aromatic monobasic monamino acids: 



Phenylalanine 



Tyrosine 



Dibasic monamino acids, 

 Aspartic acid 



Glutamic acid 



Monobasic diamino acids, 

 Arginine 



NH 



\ 



H H 



C=C CO— OH 



/ \ / 



HC C— CH,— CH 



\ // \ 



C— C NH 2 



H H 



H H 



C=C CO— OH 



/ \ / 



HOC C— CH 2 — CH 



\ // \ 



C— C NH 2 



H H 



/ 



CO— OH 



/ 



CH,— CH 



HO— OC 



\ 



NH 2 



HO- 



-OC 



CH 2 — CH 2 



-CH 



\ 



CO— OH 



NH, 



NH 2 



C— NH 



CH,- 



-CH,— CH,— CH 



CO— OH 

 / 



\ 



NH 2 



