In a gel electrophoresis [i-lek-trou-fuh-REE-sis] experiment, in which of the following directions will a DNA sample move, and why?

W) Toward the negative electrode because DNA has a positive charge

X) Toward the negative electrode because DNA has a negative charge

Y) Toward the positive electrode because DNA has a positive charge

Z) Toward the positive electrode because DNA has a negative charge
Z) TOWARD THE POSITIVE ELECTRODE BECAUSE DNA HAS A NEGATIVE CHARGE