<prompt> The reducing equivalents for cholesterol biosynthesis are provided byFADH2FMNH2NADHNADPH  <response>: Cholesterol is a 27-carbon compound consisting of 4 rings and a side chain. It is synthesized from acetyl-CoA by a lengthy pathway that may be divided into five steps:1 synthesis of mevalonate from acetyl-CoA 2 formation of isoprenoid units from mevalonate by a loss of CO2 3 condensation of six isoprenoid unitsform squalene 4 cyclization of squalene gives rise to the parent steroid, lanosterol; 5 formation of cholesterol from lanosterol.NADPH provides the reducing equivalents.Ref: Harper;s Biochemistry; 30th edition; Chapter 26; Cholesterol Synthesis, Transpo, Excretion 