Which is a non essential mineral (AIIMS NOV.2010)
Table 27–3 Trace Elements Believed Essential for Life.
a. Manganese is an essential trace nutrient in all forms of life.
b. The classes of enzymes that have manganese cofactors are very broad and include oxidoreductases, transferases, hydrolases, lyases, isomerases, ligases, lectins, and integrins.
c. The reverse transcriptases of many retroviruses (though not lentiviruses such as HIV) contain manganese.
d. The best known manganese-containing polypeptides may be arginase, the diphtheria toxin, and Mn-containing superoxide dismutase (Mn-SOD).