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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Guanine ring - True are all except ?
assistant
The correct answer is  Ans. is 'b' i.e., Asparate acts as the amino group donor for forming guanineGuanine ring is a purine ring. Hence it has nine atoms included in the ring.It is formed from IMP (Inosine Mono Phosphate). IMP undergoes dehydrogenation, in the presence of IMP dehydrogenase (NADP is the coenzyme) to form Xanthosine Mono Phosphate (XMP). XMP undergoes amination with glutamine to form GMP.On the other hand, IMP undergoes amination with Aspaate to form Adenylosuccinate. Adenylosuccinate in the presence of Adenylosuccinate lyase to form AMP and fumarate.