Question 15 of 16
The answer you chose is highlighted in reverse video. The correct answer is in bold.
Aspartate plays a role in all of the following EXCEPT:
- A. conversion of UTP to CTP.
- B. de novo synthesis of AMP.
- C. de novo synthesis of orotic acid./a>
- D. maintenance of the adenine nucleotide pool by a salvage mechanism.
- E. the synthesis of most proteins.
The correct answer is (A).
Comments:
- A. UTP to CTP does involve an amination but the amino group used is the amide of glutamine.
- B. Aspartate provides nitrogen 1 of the purine ring.
- C. The whole aspartate molecule (at least the carbons and nitrogen) becomes part of the pyrimidine ring.
- D. Maintenance of the adenine nucleotide pool involves salvaging hypoxanthine and then converting IMP to AMP using aspartate.
- E. Most, probably all, proteins include aspartate.
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cna
Last modified 1/5/95