Answer:
Gel electrophoresis is a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells indentations at one end of a gel, and an electric current is applied to pull them through the gel. DNA fragments are negatively charged, so they move towards the positive electrode. Really easy
Explanation:
The answer would have to be D
Probably through a electron microscope either TEM or SEM. or possibly a picture through the microscope. I hope that helped.
Magnets attracts or repel iron nails