<prompt> Enzymes required for mRNA synthesis isare ?RNA polymerase IRNA polymerase IIPrimaseTopoisomerase  <response>: Ans. is b i.e., RNA polymerase II It catalyzes the synthesis of mRNA, small nuclear RNA sn-RNA and miRNA.These products are coded by class II gene, i.e. class II gene is transcribed by mRNA.Class II gene differ from class I and III in that one of its transcribed products mRNA is translated into protein. 