In gel electrophoresis, how do molecules migrate through the gel?
Correct answer: C. Under the influence of an electric field
- A. Under the influence of agar
- B. By diffusion
- C. Under the influence of an electric field
- D. Active transport
- E. By osmosis
Explanation
In gel electrophoresis, molecules migrate through the gel under the influence of an electric field. When an electric current is applied, charged molecules such as DNA, RNA, or proteins move toward the electrode with the opposite charge. The gel acts as a molecular sieve, allowing smaller molecules to move faster than larger ones, thus achieving separation based on size and charge. The incorrect options, such as agar, diffusion, active transport, and osmosis, do not involve the electric field mechanism that is central to gel electrophoresis.
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