After gel electrophoresis of a DNA sample has been performed, the different bands found in one lane of a gel are

Question

Quizplus · Accepted Answer

The different bands seen in a lane of a gel after gel electrophoresis of DNA sample represent different-sized DNA molecules. This is because the DNA fragments have been separated based on their length and charge by the gel matrix and electrical current. The smaller fragments will move faster and further through the matrix, while the larger fragments will remain closer to the starting point. Therefore, the different bands represent fragments of different sizes.

B, C, and D are incorrect choices as they do not accurately represent the bands seen in gel electrophoresis. The digested restriction enzyme would not be visible in a gel, and RNA or DNA hybridization sites would require additional steps such as Northern or Southern blotting to visualize, respectively.

After Gel Electrophoresis of a DNA Sample Has Been Performed