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Explain briefly why you cannot expect to find a previous version of every file with which you work.

Which best describes the role or restriction enzymes in the analysis of edna a. to break dna into fragments that vary in size so they can be sorted and analyzed b. to amplify small amounts of dna and generate large amounts of dna for analysis c. to purify samples of dna obtained from the environment so they can be analyzed d. to sort different sizes of dna fragments into a banding pattern that can be analyzed

1. for which of the following are you not required to signal beforehand? a. changing lanes b. speeding up c. stopping