Multiple choice

Two purified DNA samples A and B contain equal number of base pairs. Each of these DNA samples has one site each for EcoRI and BamHI restriction enzymes. Complete digestion with both the enzymes yielded 3 DNA bands and 2 DNA bands respectively for A and B upon electrophoresis of the digestion products. Which one of the following explains the observation?

  1. A is circular DNA and B is linear.

  2. B is circular DNA and A is linear.

  3. A is circular DNA and B could be linear or circular.

  4. B is circular DNA and A could be linear or circular.
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A Correct answer

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