The results of gel electrophoresis are shown below, with four different strands of DNA labeled.Which strand of DNA is the shortest?A.2B.4C.3D.1

Answer

To determine which strand of DNA is the shortest from the results of gel electrophoresis, we need to consider how DNA strands behave in this technique. In gel electrophoresis, shorter DNA fragments travel faster and further through the gel than longer fragments due to less resistance.

Without the specific visual results, typically, the strands would be measured based on their positions after the electrophoresis process.

If we are to follow from the labels A. 2, B. 4, C. 3, and D. 1, we would need to identify the strand that is farthest down the gel.

• If strand 4 (B) is at the furthest position, it would be the shortest strand.
• Conversely, if strand 1 (D) is positioned closer to the well, it would be the longest.

From this context, you can identify the shortest strand based on the distance traveled. Please refer to your gel image to make the final determination, but conceptually:

• The strand that traveled furthest down the gel is the shortest.

So, determine the answer by which strand is positioned at the bottommost part of the gel. If I had to provide a specific choice, I'd say if 4 is the furthest down the gel, then B (4) is correct.