Which of the Following Characterizes a DIFFERENCE Involved in the De

question 55

Multiple Choice

Which of the following characterizes a DIFFERENCE involved in the de novo biosynthesis of purines and pyrimidines?

• A) Pentose phosphate is added before completion of a heterocyclic ring system in one case, and not the other.
• B) One heterocyclic ring system is synthesized from low molecular weight precursors, the other is not.
• C) The synthesis of one ring system involves the use of ATP as an energy source, the other does not.
• D) Asparagine is a precursor in one case, and not the other.
• E) The amino group of glutamate is an immediate precursor in the synthesis of one ring system, and not the other.

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