Study Guide for Campbell Biology
Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 27, Problem 13TYK

O157:H7, a pathogenic strain of E. coli, has over 1,000 genes that are not present in the harmless strain K-12. Many of these genes are associated with phage DNA in the bacterial chromosome. These observations suggest that

  1. a. this virulent strain has many more R plasmids than does the harmless strain and is resistant to almost all antibiotics.
  2. b. at least some of these genes were acquired through phage-mediated horizontal gene transfer.
  3. c. virulence genes appear to have been acquired through conjugation with K-12.
  4. d. all of the above are correct.
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