GENERAL KNOWLEDGE

GK

VITAMINS MINERALS COENZYMES AND DEFICIENCY DISEASES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Manganese is a key component of all of the following enzymes except
A
arginase
B
ceruloplasmin
C
pyruvate carboxylase
D
Mn-superoxide dismutase
Explanation: 

Detailed explanation-1: -Manganese has two major functions in enzymes: (i) as a Lewis acid, for which the properties of Mn are similar to Mg, Co and Zn and (ii) as an oxidation catalyst, for which it can be compared with properties similar to that of other redox active metal ions, such as Fe and Cu (Table 1).

Detailed explanation-2: -Manganese is an essential trace element that is naturally present in many foods and available as a dietary supplement. Manganese is a cofactor for many enzymes, including manganese superoxide dismutase, arginase, and pyruvate carboxylase [1, 2].

Detailed explanation-3: -Manganese oxide has strong reducibility and ability to store/release oxygen and is considered to be the most promising transition metal oxide catalyst. Manganese oxide is widely used as a catalyst for the catalytic oxidation of volatile organic compounds such as toluene, formaldehyde, and the like.

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