if dna was loaded at the top of a gel but the positive and negative poles were accidentally reversed, what would happen? a. all of the dna molecules would move towards the top of the gel. b. all of the dna molecules would move towards the bottom of the gel. c. small dna molecules would move towards the top of the gel and large dna molecules would move towards the bottom of the gel. d. small dna molecules would move towards the bottom of the gel and large dna molecules would move towards the top of the gel.