#Question id: 980
#Unit 1. Structure and Function of Biomolecules
Which enzyme catalyzes the step in purine nucleotide biosynthesis that is the principal site of regulation for the pathway?
#Question id: 981
#Unit 1. Structure and Function of Biomolecules
Which is a method by which the synthesis of AMP or GMP is regulated?
#Question id: 982
#Unit 1. Structure and Function of Biomolecules
What is the source of the N-3 during the de novo biosynthesis of pyrimidines?
#Question id: 983
#Unit 1. Structure and Function of Biomolecules
The pyrimidine ring system is shown below. What is the source of the C-2 during the de novo biosynthesis of pyrimidines?
#Question id: 984
#Unit 1. Structure and Function of Biomolecules
What is the source of the N-1 during the de novo biosynthesis of pyrimidines?
#Question id: 985
#Unit 1. Structure and Function of Biomolecules
In the pyrimidine ring system, what is the source of the carbons 4,5 and 6 during the de novo biosynthesis of pyrimidines?