In this gel, which letter (A, B, or C) indicates the largest piece of DNA in lane one? If the numbers loaded funny just count across from left to right 1 2 3 4 5 6 A C || |

In lane 1, a size standard was loaded, which contained a mix a DNA fragments known to be 1000 bp, 700 bp, 500 bp, 200 bp, and 100 bp.  When the gel was run and stained, the following photograph of the gel was taken. Click directly on the band in lane 1 that represents the DNA fragment that is 500 bp in size.

DNA is visualized during agarose gel electrophoresis by ______________ . the fact that DNA fluoresces when illuminated with UV light the binding of a fluorescent dye that is easily detectable using radioactive antibodies that specifically bind to DNA the fact that DNA is blue and can be seen when millions of copies are present in a band

Which one is the correct one?