Final answer:
The PCR products from the normal control and the DM control are equal in length.
Step-by-step explanation:
The length of the PCR products from the normal control and the DM control can be determined by comparing their sizes to the DNA molecular size marker run alongside. Since a 597-bp RT-PCR product is observed, it can be concluded that the PCR product from the normal control is equal in length to the DM control, as they are both visualized as the same size marker.