2. What could happen if the DNA samples were transferred to the wrong well of the gel plate?

DNA would be pulled through the gel in the wrong direction. The gel will be run backwards and the DNA will run off the short end of the gel into the solution within minutes and you will lose your samples and have to do the gel over again. The red electrode should be the positive electrode (anode). also If the electric field direction would be reversed, the migration of dendrimers would be in the opposite direction. You only have to inverse the polarity of the electrodes and maybe use an acidic buffer system. Consequently, the sample will be applied at the anodic rather than the cathodic end of the gel.

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.