The results of gel electrophoresis are shown below. What can you determine about the DNA from looking at the results of this test?
electrode
A. Strand 1 is the smallest.
B. Strand 2 is larger than strand 3
C. Strand 3 is larger than strand 4.
D. Strand 4 is the smallest

A

Explanation:

Gel electrophoresis is an amazing technique that allows for DNA separation based on size (as in, length). Using electricity (and keeping in mind that DNA has a negative charge because of the phosphate groups), the shortest pieces will migrate the farthest.

So we can tell that the pieces are in ascending order of size. 4>3>2>1, in length.

A. Strand 1 is the smallest.

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.