Question 10 of 16

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Direct sources of purine ring atoms in the de novo synthesis of IMP include:

1. glutamine.
2. a component of the tetrahydrofolate one-carbon pool.
3. aspartate.
4. glycine.

A. 1, 2 and 3
B. 1 and 3
C. 2 and 4
D. 4 only
E. All four

The correct answer is (E).

Comments:

1. Nitrogens 3 and 9
2. Carbons 2 and 8
3. Nitrogen 1
4. Atoms 4, 5, and 7

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Last modified 1/6/95