The purine ring system is shown below.What is the source of the N-1 atom during de novo biosynthesis of purines? 
A) Glycine.
B) Glutamine.
C) Aspartate.
D) Arginine.
Correct Answer:
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Q13: Which are purines?
A)Adenine and thymine.
B)Guanine and adenine.
C)Cytosine
Q14: The purine ring system is shown below.What
Q15: Which structure below is PRPP? 
Q16: Four of the ten enzymes required for
Q17: Which is a method by which the
Q19: The first nucleotide product in the de
Q20: Which is a common precursor in the
Q21: Substrates for reduction to form deoxyribonucleotides are
A)mononucleotides.
B)trinucleotides.
C)dinucleotides.
D)B
Q22: Which type of enzymes catalyze the phosphorylation
Q23: Which is the correct order for the
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