Biology · Principles and Processes in Biotechnology

Refer to the agarose gel electrophoresis diagram (Figure 9.3). Which lane represents the undigested DNA sample, and which end contains the smallest DNA fragments?

1. A
   Lane 1 represents undigested DNA; smallest fragments are nearest to anode (bottom).
2. B
   Lane 4 represents undigested DNA; smallest fragments are nearest to wells.
3. C
   Lane 1 represents digested DNA; smallest fragments are nearest to wells.
4. D
   Lane 2 represents undigested DNA; largest fragments move farthest towards anode.