<prompt> Sterols are found in ?Cell wall of RicketssiaCell membrane of RicketssiaCell wall of MycoplasmaCell membrane of Mycoplasma  <response>: Ans. is d i.e., Cell membrane of Mycoplasma Mycoplasma lack cell wall. They are bounded by triple layered unit membrane that contains sterol. o Thus they require cholesterole and related sterols. 