This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Carbohydrates, Subject name: Biochemistry
[{'content': 'Glycogenin primer is glucosylated by: \nSelect and explain. \nA. UDP Glucose, B. Glucose 1 PO4, C. UDP Glucose 1 PO4, D. UDP Glucose 6 PO4', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. UDP Glucose(Ref: Harper 31/e page 164)Glycogenin, a 37 kDa protein is glucosylated on specific tyrosine residue by UDP glucose.Glycogenenin catalyses transfer of 7 glucose residue from UDP-Glc, in l-4 linkage to form Glycogen primer.Further Glucose on glycogen primer are added by Glycogen Synthase to nonreducing end till growing chain is at least 11 glucose residue long.', 'role': 'assistant'}]