Multiple choice What occurs during the very beginning of the transcription process? Thymine is converted to uracil mRNA is built using RNA polymerase DNA is unwound DNA is wound back up Reveal answer Fill a bubble to check yourself C Correct answer Explanation Before RNA polymerase can read the template strand to build mRNA, the DNA double helix must be unwound and separated at the promoter region to expose the bases. Once unwound, the enzyme can begin synthesizing the complementary RNA strand.