This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Biology, Subject name: Biochemistry
In Eukaryotes, mRNA is produced by 
Select and explain. 
A. RNA Polymerase I, B. RNA Polymerase II, C. RNA Polymerase III, D. RNA Polymerase IV
B: RNA Polymerase II
Answer: B: RNA Polymerase II 
Explanation: There is only 1 RNA polymerase in prokaryotes. There are 3 eukaryotic RNA polymerases Type Location RNA transcribed Effect of a-amanitin I Nucleolous 18, 5.8, 28 rRNA Insensitive II Nucleoplasm mRNA, miRNA, snRNA Highly sensitive III Nucleoplasm tRNA, 5s rRNA , U6 snRNA Less sensitive