SECTION A

1. What are the excretory products of purine catabolism?
2. Draw the nuclear skeleton of purine and indicate the sources of various atoms in it.
3. Give any two inhibitors of nucleotide biosynthesis.
4. How is purine base converted to purine nucleotide?
5. Name any two inhibitors of pyrimidine biosynthesis and enumerate their importance.
6. Define NAD.
7. What is the role of FAD in metabolism?
8. Draw the nuclear skeleton of pyrimidine.