I guessed and got the right answer but Im having a hard time understanding why it's correct. Can someone visualize it pleaseeee? :)) A pre-mRNA molecule contains two exon–intron boundary sites that are equidistant from each other and from the ends of the pre-mRNA molecule. How will the size of the final mRNA product compare to its pre-mRNA precursor? The final mRNA molecule will be two-thirds as long as its pre-mRNA precursor. The final mRNA molecule will be one-third as long as its pre-mRNA precursor. The final mRNA molecule will be one-half as long as its pre-mRNA precursor. The final mRNA molecule will be three-fourths as long as its pre-mRNA precursor. submitted by /u/Alarming-Ad-8663 [link] [comments]