A molecular biologist treats a 600-bp length of linear DNA with HindIII restriction endonuclease. Following gel electrophoresis, the biologist observes that there is only one band on the gel and it corresponds with the migration distance of the 200-bp molecular weight marker. Assuming that no procedural errors were made, what can be concluded from these results?
A. Three HindIII recognition sequences were present in the original DNA.
B. One HindIII recognition sequence was present in the original DNA.
C. There were no HindIII recognition sequences present in the original DNA.
D. Two HindIII recognition sequences were present in the original DNA.
Answer: D
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