The form transporting and storing ammonia in the body is (    ).  A: glutamate B: glutamine C: glutathione D: glycine E: urea

Nitrogen or carbon atoms are contributed to the structure of the purine ring by amino acids, except: A: Glycine B: Glutamine C: Aspartate D: Glutamate

Which of the following is not the direct material of de novosynthesis of purine nucleotide ? () A: glycine B: aspartate C: glutamate D: CO2 E: one carbon unit

Analog of sulfonamide is (    ). A: folic acid (FA) B: dihydrofolic acid (DHFA) C: tetrahydrofolic acid (THFA)  D: paraaminobenzoic acid (PABA)  E: glutamate

Few of the properties in pyrimidine synthesis is that ( ) A: the base is synthesized based on 5-phosphate ribose B: One carbon unit is provided by FH4 C: Whole aspartic acid molecule incorporates in the synthesis D: The first synthesized intermediate is carbamoyl phosphate E: Glutamate is the nitrogen donor