Question

which sample provided below has the smallest dna fragment?

Explanation:

Step1: Recall DNA gel electrophoresis principle

In gel electrophoresis, smaller DNA fragments migrate farther through the gel matrix.

Step2: Analyze the samples' bands

• Sample A: Bands at higher (larger bp) and some middle positions.
• Sample B: Bands include a relatively middle and some lower, but not the lowest.
• Sample C: Has a band that migrated the farthest (closest to the bottom of the gel, smallest bp among the samples' bands). By comparing the migration distances of bands in samples A, B, and C, the band in sample C that is the lowest (farthest migrated) indicates the smallest DNA fragment.

Answer:

Sample C