Step 1 Step 2 Step 3
DNA ⭢ Pre-mRNA ⭢ mRNA ⭢ Protein

which of the following best describes an event during step 2 in the simplified model above?
A. a new rna molecule is synthesized using a dna template.
B. a new polypeptide is synthesized using an rna template.
C. thymine nucleotides in an rna molecule are replaced with uracil nucleotides.
D. noncoding sequences are removed from a newly synthesized rna molecule.