In gel electrophoresis, DNA moves towards the positive electrode because

  1. it is negatively charged due to phosphate groups
  2. it is small
  3. it is attracted by agarose
  4. it is positively charged
Answer

A) it is negatively charged due to phosphate groups

Phosphates carry negative charge. AS & A Level Biology · Topic 19 Genetic Technology · 19.1 Principles of genetic technology

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