<prompt> Sulphur of cystein are not used utilized in body for the following processproduct:Help in conversion of cyanide to thiocynateThiosulphate formationIntroduction of sulphur atom in methionineDisulfide bond formation bw two adjacent peptide  <response>: Ans: C Introduction of ... 285-86;Lippincott 6th263-68; Shinde 7th471 - 73.578; Vasudevan 5thl 91; Satyanarayan 3rd361The H2S derived from the cysteine may be oxidized to sulfites thiosulfates further oxidized to sulfate - Vasudeian 5thl 93Two molecules of cysteine are joined together by S-S bond to form one molecule of cystine disulphide bond- Shinde 7th473DEGRADATION OF CYSTEINE Vasudevan Sth191Transamination: Cysteine transaminates to form beta me rcapto pyruvic acid finally pyruvate. The beta mercapto pyruvate can transfer S to CN to form thiocynate SCNThe sulphur mav be removed either as H.25 or elemental sulphor or as sulfiteCysteine on decarboxylation gives beta mercapto ethanol- amine . This is used for synthesis of co-enzyme AFormation of cysteine is by using the carbon skeleton contributed by serine sulphur originating from methionine- Vasudevan 5th191Sulphur containing amino acids in body are- methionine, cysteine cystine. Other source of sulphur in body are sulphur containing amino acids: thiamine, lipoic acid biotin- Shinde 7th471Cystine; This amino acid is reduced to cysteine, using NADH H as a reductant. Cysteine undergoes desulfuration to yield pyruvate.Note; The sulfate released can be used to synthesize 3-phosphoadenosine-5r-phosphosulfate PAPS, an activated sulfur donor to a variety of acceptorsj.Cysteine can be oxidized to its disulfide derivative, cystine- Lippincott 6th263 