Gel Electrophoresis Restriction Enzymes
Several DNA samples were digested with different restriction enzymes (endonucleases) and separated by gel electrophoresis, as shown.

The terms "EcoRI," "HaeIII," and "HindIII" refer to which of the following?
A
The organisms from which the original DNA samples were obtained
B
The restriction enzymes used to digest the DNA
C
The buffers used to maintain a constant pH during sample processing
D
The types of proteins encoded by each DNA fragment
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