This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of nucleic acids, Subject name: Biochemistry
To synthesize insulin on a large scale basis, the most suitable staing material obtained from the beta cells of the pancreas is 
Select and explain. 
A. Genomic DNA, B. Total cellular RNA, C. cDNA of insulin, D. mRNA of insulin
D: mRNA of insulin
Answer: D: mRNA of insulin 
Explanation: the mRNA act as messenger transpoing the information in the gene in DNA to the protein synthesizing machinery in the cytoplasmRef: DM VASUDEVAN, 7th edition, page no: 558