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The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________

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The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________

(a) Diphteria toxin and cholera toxin

(b) Dinitrogenase reductase

(c) Protein phosphatases

(d) Protein kinases

The question was posed to me in final exam.

The query is from Regulatory Enzymes topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry

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Right option is (d) Protein kinases

For explanation I would say: The enzymes that catalyse the ADP-ribosylation and inactivation of key cellular enzymes or proteins are diphteria toxin and cholera toxin. Dinitrogenase reductase is responsible for the regulation of biological nitrogen fixation. Removal of phosphoryl groups is catalyzed by Protein phosphatases.

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