<prompt> Cyanide inhibitsPyrurate kinaseCytochrome C oxidaseEnolaseNone  <response>: Site-III Complex IV Cyanide H2S Azide transfer of electrons to molecular O2 Co Carbon monoxide: Inhibits Cyt. oxidase by combining with O2 binding site. It can be reversed by illumination with light.Ref: MN Chatterjea Textbook of Medical Biochemistry, 8th edition, page no: 143 