Multiple Choice
The pyrimidine ring system is shown below.What is the source of the N-3 during the de novo biosynthesis of pyrimidines? 
A) Ammonia.
B) Glutamine.
C) Arginine.
D) Urea.
Correct Answer:
Verified
Correct Answer:
Verified
Q54: Carbamoyl phosphate synthetase I is located in
Q55: PRPP synthetase is inhibited by several purine
Q56: Which catalytic site is not contained in
Q57: The first nucleotide product in the de
Q58: Virtually all organisms and tissues can synthesize
Q60: During de novo biosynthesis of the purine
Q61: Xanthine oxidase catalyzes the formation of _.<br>A)xanthine<br>B)uric
Q62: Substrates for reduction to form deoxyribonucleotides are<br>A)mononucleotides.<br>B)trinucleotides.<br>C)dinucleotides.<br>D)B
Q63: Which is the correct order for the
Q64: Which is the correct order for the