This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
[{'content': 'ApoB 48 & ApoB 100 is synthesized from them RNA; the difference between them is due to: \nSelect and explain. \nA. RNA splicing, B. Allelic exclusion, C. Deamination of cytidine to uridine, D. Upstream repression', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Deamination of cytidine to uridine(Ref: Harper 31/e page 390)An example is the apolipoprotein B (apoB) gene and mRNA.In the liver, the single apo B gene is transcribed into an mRNA that directs the synthesis of apo B100.In the intestine, the same gene directs the synthesis of the primary transcriptA cytidine deaminase converts a CAA codon in them RNA to UAA at a single specific siteRather than encoding glutamine, this codon becomes a termination signal apo B48 is the result.', 'role': 'assistant'}]