Q. 7 The site of production of ADA in the body is
(a) erythrocytes                               

(b) lymphocytes                         

(c) blood plasma                             

(d) osteocytes

(b) ADA gene is responsible for producing the enzyme adenosine deaminase. Which is primarily involved in the development and maintenance of immune system.

It is produced in all cells, but the highest level of adenosine deaminase occurs in the cells of immune system called lymphocytes, which develop in lymphoid tissues. ADA converts deoxyadenosine (toxic to lymphocytes ) to deoxyinosine (non-toxic form)