Following is true regarding sulhydryl groups except?

Following is true regarding sulhydryl
groups except?
a) They are present in coenzyme A and lipoic acid
b) They are present in Captopril and penicillamine
c) They are not involved in reduction of peroxides
d) They are present in cysteine
Correct Answer - C
Ans. is ‘c’ i.e., They are not involved in reduction of peroxides
Sulfhydryl Group (or thiol group)
It is an SH group of organic compounds.
Sulfhydryl groups have great and varied reactivity. They oxidize
easily, with the formation of disulfides and
sulfenic, sulfinic, or sulfonic acids, and they readily undergo
alkylation, acylation, and thiol-disulfide exchange.
They form mercaptides upon reacting with the ions of heavy metals,
and they form mercaptals and mercaptols upon reacting with
aldehydes and ketones, respectively.
Sulfhydryl groups play an important role in biochemical processes.
The sulfhydryl groups of coenzyme A, lipoic acid, and 4’-
phosphopantotheine participate in enzymatic reactions for the
formation and transfer of acyl residues that are related to lipid and
carbohydrate metabolism.
The sulfhydryl groups of glutathione play an important role in the
neutralization of foreign organic compounds and the reduction of
peroxides; they are also of major importance in the fulfillment by
glutathione of its function as a coenzyme.
In proteins, residues of the amino acid cysteine have sulfhydryl
groups.