<prompt> The important intermediate product of biosynthesis of fatty acid isCholesterolMalonyl CoAAcetyl CoAThioesterases  <response>: Malonyl CoA Acetyl-CoA is the immediate substrate for fatty acid synthesis.However, acetyl-CoA needs to be converted to the activated form, which will serve as the donor of carbon units to the growing fatty acid chain.Malonyl-CoA is such activated form; acetyl-CoA is converted to malonyl-CoA by acetyl-CoA carboxylase. 