A circular DNA molecule is subjected to complete restriction digestion by (1) BamHI alone, (2) Haelll alone, and (3) both enzymes together. The DNA fragments are then separated using gel electrophoresis. Results are shown in Figure 2: BamHI Haelll Both

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Chapter10: Biotechnology
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A circular DNA molecule is subjected to complete restriction digestion by (1) BamHI alone,
(2) Haelll alone, and (3) both enzymes together. The DNA fragments are then separated using
gel electrophoresis. Results are shown in Figure 2:
BamHI Haelll Both
10 kb
9 kb
8 kb
5 kb
2 kb
1 kb
Figure 2
(i)
How long is the original DNA molecule?
(ii)
Does the longest BamHI fragment contain a Haelll restriction site? Explain your
answer.
(ii)
The same restriction digestion experiment was repeated for BamHI on the same DNA
molecule. However, the incubation period of the reaction was lengthened for
additional 30 minutes. Figure 3 illustrates the results after gel electrophoresis. Why is
the result different from the earlier gel? Discuss your answer.
BamHI
10 kb
9 kb
8 kb
5 kb
2 kb
1 kb
Figure 3
Transcribed Image Text:A circular DNA molecule is subjected to complete restriction digestion by (1) BamHI alone, (2) Haelll alone, and (3) both enzymes together. The DNA fragments are then separated using gel electrophoresis. Results are shown in Figure 2: BamHI Haelll Both 10 kb 9 kb 8 kb 5 kb 2 kb 1 kb Figure 2 (i) How long is the original DNA molecule? (ii) Does the longest BamHI fragment contain a Haelll restriction site? Explain your answer. (ii) The same restriction digestion experiment was repeated for BamHI on the same DNA molecule. However, the incubation period of the reaction was lengthened for additional 30 minutes. Figure 3 illustrates the results after gel electrophoresis. Why is the result different from the earlier gel? Discuss your answer. BamHI 10 kb 9 kb 8 kb 5 kb 2 kb 1 kb Figure 3
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