What is the definition of a salvage pathway and a de novo, Ask an Expert

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1.What is the definition of a salvage pathway and a de novo pathway for biosynthesis? Show the salvage enzymes for both the purines and pyrimidines.
2. Distinguish the structures of the purine and pyrimidine bases. Show the nomenclature for the free base, the nucleosides and the nucleotides.
3. What is the source of each atom in the purine ring? What about the pyrimidine ring? How are amino acids necessary for nucleotide biosynthesis? Give examples.

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