<prompt> Each of the following is a physiological uncoupler EXCEPT:2,4 dinitrophenolThyroid hormoneUnconjugated bilirubinLong chain fatty acid  <response>: Ans. A. 2,4 dinitrophenol Compounds that can uncouple or delink the ETC from oxidative phosphorylation, such compounds are known as uncouplers As a result ATP synthesis doesnt occur. 2,4 Dinitrophenol is an example of chemical uncoupler.Chemical uncouplers Chemical uncouplers Physiological uncouplers 2, 4 dinitrophenol has been extensively studied Thyroid hormones Dinitrocresol Long chain fatty acids Pentachlorophenol Unconjugated bilirubin Tri fluoro carbonyl cyanide phenyl hydra zone FCCP These act as uncouplers only at high concentration Aspirin high doses 