B. the chylomicra. E. the remnant particles. The committed step in purine synthesis is the step in which A. uric acid is formed from xanthine. B. glutamine is incorporated intact into the molecule on the sugar phosphate unit. D. phosphoribosylamine is formed enzymatically from PRPP and glutamine.
E. bicarbonate is utilized to carboxylate aminoimidazole ribonucleotide.
Serine is a non-essential amino acid. A. glutamic acid B. Methionine C. 3-phosphoglyceric acid D. pyruvic acid E. oxaloacetate 18. B. involves reacylation of 2-monoacylglycerol. C. is depressed under conditions of bile duct obstruction. D. precedes appearance of lipoproteins in the lymph. The major cholesterol-containing lipid fraction in blood is A. chylomicrons B. VLDL C. LDL D. IDL E. HDL 21.