<prompt> In fatty acid synthesis CO2 step loss occurs in which?HydrationDehydrationCondensation reactionReduction  <response>: Ans. C. Condensation reactionRef: Harper 31e page 218Reactions of Fatty Acid Synthase Complex by three stagesCondensationReductionRelease of fatty acidCondensation Reactions1. MalonyAcetyl transacylaseA priming molecule of acetyl-CoA combines with a cysteine--SH group.While malonyl-CoA combines with the adjacent-- SH on the 4-phosphopantetheine of ACP of the other monomer.These reactions are catalyzed by malonyl acetyl transacylase, to form acetyl acyl-malonyl enzyme2. Ketoacyl synthaseThe acetyl group attacks the methylene group of the malonyl residue, catalyzed by 3-ketoacyl synthase, and liberates CO2 , forming 3-ketoacyl enzyme aceto acetyl enzyme reaction2, freeing the cysteine--SH group. 