<prompt> The following poisons act by causing inhibition of complex IV of respiratory chain exceptCyanideMalonateH2SCO  <response>: Ans. b Malonate Ref. Harper 28th108; 109Harper 18thA08:The classic poisons H2S, carbon monoxide, and cyanide inhibit Complex IV and can therefore totally arrest respiration. Malonate is a competitive inhibitor of Complex II.PoisonInhibits1. Barbiturates amobarbital2. Malonate3. Antimycin A and dimercaprol4. H2S, carbon monoxide, and cyanide5. Atractyloside Electron transport via Complex 1 by blocking the transfer from Fe-S to Q.deg Competitive inhibitor of Complex II. Respiratory chain at Comfllex III Complex IV and can therefore totally arrest respiration.0 Oxidative phosphorylation by inhibiting the transporter of ADP into and ATP out of the mitochondrion. 