PROTEINS 



121 



with the amino (NH 2 ) group of the other with the elimination of a mole- 

 cule of water." These pep tides are more fully discussed on pages 70 

 and 119. 



REVIEW OF PROTEINS 



In order to facilitate the student's review of the proteins, the prepara- 

 tion of a chart similar to the model given is recommended. The signs 4- 

 and may be conveniently used to indicate positive and negative 

 reactions. 



MODEL CHART FOR REVIEW PURPOSES 



" UNKNOWN" MIXTURES AND SOLUTIONS OF PROTEINS 



At this point the student's knowledge of the characteristics of the 

 various proteins studied will be tested by requiring him to examine several 

 "unknown" protein mixtures or solutions and make full report upon the 

 same. The scheme given on page 122 may be used in this examination. 



