NEET · BiologyEasy
Which technique is used to separate DNA fragments based on their size?
- A.Polymerase chain reaction
- B.Gel electrophoresis
- C.Southern blotting
- D.Transformation
Show correct answer & step-by-step solution
Correct answer: B — Gel electrophoresis
Solution
- DNA molecules are negatively charged due to their phosphate backbone.
- When placed in an electric field, they migrate toward the positive electrode.
- The gel matrix acts as a sieve, allowing smaller fragments to move faster than larger ones.
- Hence the answer is (B).
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