Concept explainers
(a)
Interpretation:
The activated reactant used to synthesize phosphoribosylamine is to be determined.
Concept introduction:
Purine is a heterocyclic ring, which is composed of a pyrimidine ring fused with an imidazole ring. Adenine and guanine found in DNA and RNA are purines. It is oxidized into uric acid by the action of xanthine oxidase. Further, it is also involved in the formation of certain alkaloids, such as caffeine, and theophylline.
(b)
Interpretation:
The activated reactant used to synthesize orotidylate is to be determined.
Concept introduction:
Pyrimidine is a heterocyclic nitrogenous base, which is found in the DNA and RNA. DNA has cytosine and thymine as pyrimidines, and RNA has uracil and cytosine has pyrimidines. It is a six-membered ring that contains two nitrogen atoms at 1 and 3 positions.
(c)
Interpretation:
The activated reactant used to synthesize carbamoylaspartate is to be determined.
Concept introduction:
Pyrimidine is a heterocyclic nitrogenous base, which is found in the DNA and RNA. DNA has cytosine and thymine as pyrimidines, and RNA has uracil and cytosine has pyrimidines. It is a six-membered ring that contains two nitrogen atoms at 1 and 3 positions.
(d)
Interpretation:
The activated reactant used to synthesize phosphoribosylanthranilate is to be determined.
Concept introduction:
Pyrimidine is a heterocyclic nitrogenous base, which is found in the DNA and RNA. DNA has cytosine and thymine as pyrimidines, and RNA has uracil and cytosine has pyrimidines. It is a six-membered ring that contains two nitrogen atoms at 1 and 3 positions.
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Biochemistry
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