<prompt> Which of the following is the allosteric activator of carbamoyl phosphate synthase I?GlutamineOxaloacetateN-acetyl aspaateN-acetyl glutamate  <response>: Carbamoyl phosphate synthase I is the rate-limiting enzyme of the urea cycle Active only in the presence of N-acetylglutamateNAG, an allosteric activator that enhances the affinity of the synthase for ATP. Arginine is the allosteric activator of NAG synthase. 