Molecular Biology Of The Cell 6th Edition by Bruce Alberts, Alexander Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter

Exercise 3

You have attached an RNA polymerase molecule to a glass slide and have allowed it to initiate transcription on a template DNA that is tethered to a magnetic bead as shown in Figure Q6-2. If the DNA with its attached mag- netic bead moves relative to the RNA polymerase as indi- cated in the figure in which direction w2 ill the bead rotate?
A. Exons 2 and 3 must have the same number of nucleotides. b. Exons 2 and 3 must each contain an integral num- ber of codons (that is, the number of nucleotides divided by 3 must be an integer).
C. Exons 2 and 3 must each contain a number of nucleotides that when divided by 3 leaves the same remainder (that is, 0, 1, or 2).