Campbell Biology (10th Edition)
Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Chapter 20, Problem 8TYU

Which Ii of the following sequences in double-stranded DNA is most likely to be recognized as a cutting site for a restriction enzyme?

(A) AAGG

TTCC

(B) GGCC CCGG

(C) ACCA TGGT

(D) AAAA TTTT

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The restriction endonuclease NciI recognizes and cuts the five-base-pair sequence 5’- CC(G/C)GG-3’ [where (G/C) means either G or C will work at that position]. (1) How often, on average, would this sequence occur in random DNA? Assume the DNA contains 25% each of A, G, T & C. (2) After digestion, Nci1 leaves a one-base 5’ overhang. Write/draw the cut site/digested products.
please do only part D .
The following diagram shows one-half of a restriction site. (a) Draw the other half. GAC G I C (b) Use heavy arrows (↑1) to identify type II cleavage sites that would yield blunt-ended duplex DNA products. (c) Use light arrows (T1) to identify type II cleavage sites yielding staggered cuts that could be converted directly to recombinant DNA molecules by DNA ligase, with no other enzymes involved. (d) If this were the recognition site for a type I restriction endonu- clease, where would cutting of the duplex occur? (e) If DNA sequences were completely random, how large an inter- val (in kilobase pairs) would you expect between identical copies of this sequence in DNA?

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