344 BACTERIOLOGICAL CHEMISTRY 



Strains which lack gene 1 will grow only if anthranilic 

 acid, indole or tryptophane is supplied in the medium. 

 Strains lacking gene 2 will grow if indole or tryptophane 

 is supplied. The lack of a particular gene is specifically 

 responsible for the absence of the corresponding enzyme. 



For further information : — 



G. W. Beadle, " Genetics and Metabolism in Neurospora.''' Physiol. Rev 

 25 (1945), 643. 



M. Bergmann, " The Structure of Proteins in Relation to Biological Pro- 

 bkms." Che?n. Rev., 22 (1938), 423. 



R. E. Buchanan and E. I. Fulmer, " The Physiology and Biochemistry 

 of Bacteria," Vol. I, Chapter III. Bailliere, Tindall & Cox. London, 

 1928. 



W. M. Stanley, " The Biochemistry of Viruses." Ann. Rev. Biochemistry, 

 9 (1940), 545. 



