Which amino acid is involved in both purine and pyrimidine synthesis： A: Asp B: Gln C: Gly D: Asn

Which of the following atom of pyrimidine ring is provided by CO2? A: C1 B: C6 C: C5 D: C4 E: C2

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

Nefazodone is prone to be oxidized and metabolized to produce toxic metabolites. Which of the following strategies are used by scientists to optimize its structure and reduce liver toxicity A: F atom closes metabolic sites B: Benzene ring replaced with pyrimidine ring C: Increase metabolic site steric hindrance D: Introduce metabolizing sites to change metabolic pathways