<prompt> Thermogenin is present inCytoplasmMitochondriaRibisomeNucleus  <response>: Thermogenin, a protein present in the inner mitochondrial membrane of adipocytes, provides an alternate pathway for protons. It is one of the uncoupling proteins UCP.Ref: DM Vasudevan Textbook of Medical Biochemistry, 6th edition, page no: 234 