Which technique separates DNA fragments according to their size?
Answer and explanation
Correct answer: D. Gel electrophoresis
- Step 1: DNA is negatively charged and moves through a gel toward the positive electrode. Step 2. Smaller fragments move farther. Answer: gel electrophoresis. Why not the others: a Western blot detects proteins, flow cytometry counts cells and mass spectrometry is not used to size DNA this way.
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