... DNA fragment? Sample five has the smallest DNA fragment because one of its bands traveled the farthest through the agarose gel. e. Based on your conclusion of the gel, what is your conclusion about the DNA samples in the photograph? Do any of the samples seem to be from the same source? If so, which ones? Describe the evidence that supports your conclusion. Sample four, or suspect two, matches the DNA from the crime scene perfectly. This must mean that the DNA fragments came from the same source and were cut by restriction enzymes in the same place. 2. A restriction endonuclease "cuts" two DNA molecules at the same location. What can you assume is identical about the molecules at that location? The DNA molecules must have identical palindromes that the enzyme cuts at the restriction site. 3. What are restriction enzymes? How do they work? What are restriction sites? Restriction enzymes are degradative enzymes that recognize ...

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