<prompt> Bile acid synthesis is autoregulated by the enzyme:7-Alpha hydroxylase11-alpha hydroxylaseAcetoacetyl-CoA thiolaseDesmosterol reductase reductase  <response>: 11-alpha hydroxylase Conves 11-deoxycoisol to 11-alpha coisol the 11-alpha isomer of hydrocoisone Bile acid synthesis is autoregulated by 7-hydroxylase, the initial enzyme in cholesterol degradation Other enzymes are involved in cholesterol biosynthesis. Ref: Harrison, E-18, P-2462. 