PRESCOTT'S MICROBIO W/PROCTORIO
11th Edition
ISBN: 9781264731060
Author: WILLEY
Publisher: MCG
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Chapter 16.6, Problem 2CC
For F+, Hfr, and F– strains of E. coli, indicate which acts as a donor during conjugation, which acts as a recipient, and which transfers chromosomal DNA.
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By conducting conjugation experiments between Hfr and recipientstrains, Wollman and Jacob mapped the order of many bacterialgenes. Throughout the course of their studies, they identified severaldifferent Hfr strains in which the F-factor DNA had been integratedat different places along the bacterial chromosome. A sample of theirexperimental results is shown in the following table:Analyze data. Compare and contrast. Make a drawing.
In E. coli, the gene bioD+ encodes an enzyme involved in biotin synthesis, and galK+ encodes an enzyme involved in galactose utilization. An E. coli strain that contained wild-type versions of both genes was infected with P1 phage, and then a P1 lysate was obtained. This lysate was used totransduce (infect) a strain that was bioD− and galK−. The cellswere plated on a medium containing galactose as the sole carbonsource for growth to select for transduction of the galK+ gene.This medium also was supplemented with biotin. The resultingcolonies were then restreaked on a medium that lacked biotin tosee if the bioD+ gene had been cotransduced. The following resultswere obtained:What topic in genetics does this question address?
In E. coli, the gene bioD+ encodes an enzyme involved in biotin synthesis, and galK+ encodes an enzyme involved in galactose utilization. An E. coli strain that contained wild-type versions of both genes was infected with P1 phage, and then a P1 lysate was obtained. This lysate was used totransduce (infect) a strain that was bioD− and galK−. The cellswere plated on a medium containing galactose as the sole carbonsource for growth to select for transduction of the galK+ gene.This medium also was supplemented with biotin. The resultingcolonies were then restreaked on a medium that lacked biotin tosee if the bioD+ gene had been cotransduced. The following resultswere obtained:What information do you know based onthe question and your understanding of the topic?
Chapter 16 Solutions
PRESCOTT'S MICROBIO W/PROCTORIO
Ch. 16.1 - Retrieve, Infer, Apply List three ways in which...Ch. 16.1 - Compare and contrast the means by which the...Ch. 16.1 - Give examples of intragenic and extragenic...Ch. 16.1 - Retrieve, Infer, Apply Sometimes a point mutation...Ch. 16.1 - Retrieve, Infer, Apply Why might a missense...Ch. 16.2 - How would you screen for a tryptophan auxotroph?...Ch. 16.2 - Why is a small amount of histidine added to the...Ch. 16.2 - Retrieve, Infer, Apply Describe how replica...Ch. 16.2 - Retrieve, Infer, Apply Why are mutant selection...Ch. 16.2 - Retrieve, Infer, Apply Briefly discuss how...
Ch. 16.2 - Describe how you would isolate a mutant that...Ch. 16.2 - Prob. 5CCCh. 16.3 - How is mismatch repair similar to DNA polymerase...Ch. 16.3 - How is damaged DNA recognized by the UvrAB...Ch. 16.3 - Prob. 1CCCh. 16.3 - Retrieve, Infer, Apply What role does DNA...Ch. 16.3 - Retrieve, Infer, Apply When E. coli cells are...Ch. 16.3 - Explain how the following DNA alterations and...Ch. 16.4 - An antibiotic-resistance gene located on a...Ch. 16.4 - What four fates can DNA have after entering a...Ch. 16.4 - How does homologous recombination differ from...Ch. 16.5 - What features are common to all types of...Ch. 16.5 - How does a transposon differ from an insertion...Ch. 16.5 - What is simple (cut-and-paste) transposition? What...Ch. 16.5 - What effect would you expect the existence of...Ch. 16.6 - Prob. 1MICh. 16.6 - What is bacterial conjugation and how was it...Ch. 16.6 - For F+, Hfr, and F strains of E. coli, indicate...Ch. 16.6 - Describe how F+ F and Hfr conjugation processes...Ch. 16.6 - Compare and contract F+ F and F F conjugation.Ch. 16.7 - According to this model, what would happen if DNA...Ch. 16.7 - Prob. 1CCCh. 16.7 - Describe how transformation occurs in S....Ch. 16.7 - Discuss two ways in which artificial...Ch. 16.8 - Compare the number of transducing particles that...Ch. 16.8 - Why cant the gal and bio genes be transduced by...Ch. 16.8 - Describe generalized transduction and how it...Ch. 16.8 - What is specialized transduction and how does it...Ch. 16.8 - How might one tell whether horizontal gene...Ch. 16.8 - Why doesnt a cell lyse after successful...Ch. 16.8 - Describe how conjugation, transformation, and...Ch. 16.9 - As a replicative transposon, what would happen if...Ch. 16 - Prob. 1RCCh. 16 - Prob. 2RCCh. 16 - Prob. 3RCCh. 16 - Prob. 4RCCh. 16 - Prob. 5RCCh. 16 - Prob. 6RCCh. 16 - Mutations are often considered harmful. Give an...Ch. 16 - Mistakes made during transcription affect the cell...Ch. 16 - Suppose that transduction took place when a U-tube...Ch. 16 - Suppose that you carried out a U-tube experiment...Ch. 16 - Prob. 5ALCh. 16 - Prob. 6ALCh. 16 - Prob. 7AL
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- By conducting conjugation experiments between Hfr and recipientstrains, Wollman and Jacob mapped the order of many bacterialgenes. Throughout the course of their studies, they identified severaldifferent Hfr strains in which the F-factor DNA had been integratedat different places along the bacterial chromosome. A sample of theirexperimental results is shown in the following table:What information do you know based on the question and your understanding of the topic?arrow_forwardAustin Taylor and Edward Adelberg isolated some new strains of Hfr cells that they then used to map several genes in E. coli by using interrupted conjugation . In one experiment, they mixed cells of Hfr strain AB-312, which were xyl+ mtl+ mal+ met+ and sensitive to phage T6, with F− strain AB-531, which was xyl− mtl− mal− met− and resistant to phage T6. The cells were allowed to undergo conjugation. At regular intervals, the researchers removed a sample of cells and interrupted conjugation by killing the Hfr cells with phage T6. The F− cells, which were resistant to phage T6, survivedand were then tested for the presence of genes transferred from the Hfr strain. The results of this experiment are shown in the accompanying graph. On the basis of these data, give the order of the xyl, mtl, mal, and met genes on the bacterial chromosome and indicate the minimum distances between them.arrow_forwardWe have two specific strains of E. coli that have shown horizontal gene transfer (HGT) when mixed. To experimentally determine the method of HGT that is happening, the following conditions are set up in different tubes of culture media: A) Donor and recipient strain mixed together (control - no treatment). B) Donor and recipient strains mixed together, DNase added (can digest DNA in solution, not within cells).C) Special tube containing a membrane filter (with pores that allow DNA and viruses to pass through, but not bacterial cells) that separates two compartments. Donor strain is added on one side, the recipient strain on the other (they are separated by the filter).D) Donor and recipient strains mixed together, with chemical that inactivates viruses (chemical affects bacteriophages in solution so they are unable to attach to cells). The results: Tubes A, B, and D: HGT was observed. Tube C: HGT was NOT observed. Based on this, which type of HGT was occurring? Conjugation,…arrow_forward
- Wild-type bacteria were used as donors to transduce the following recipient genotypes with the results indicated as the number of wild type colonies: Recipient Recipient leu- phe+ his- met+ tyr+ leu- phe+ his+ met- tyr+ leu- phe+ his+ met+ tyr- leu- phe- his+ met+ tyr+ leu+ phe+ his-met- tyr+ 127 leu+ phe-his- met+ tyr+ #wild type 37 138 132 1 leu+ phe+ his- met+ tyr- leu+ phe-his+ met- tyr+ leu+ phe-hist met+ tyr- leu- phe+ his+ met+ tyr+ 22 6 leu+ phe+ his+ met- tyr- 148 31 304 leu+ phe+ his+ met+ tyr- What is the order of the genes? tyr-leu-his-phe-met O leu-met-phe-his-tyr leu-his-met-tyr-phe his-tyr-leu-phe-met #wild type 356 10arrow_forwardDetermine the map distances between the genes.arrow_forwardBacteriophage P22 was used in generalised transduction experiments to infect the Salmonella typhimurium donor strains described in the table below. The resulting phage lysates were then used to infect the recipient strains of S. typhimurium recipient strains listed in the table. In each cross, a phenotype was selected for one of the selected for one of the three genetic markers studied (str, aceA, thrA), and were made to select the recombinants corresponding to the other two markers. markers. The results are given in the following table: Strain I donor str thrA aceA thrA str aceA+ Strain recipient strs thrA+ aceA thrA str aceA Phenotype selected Str Ace+ Str recombinants selected ThrA ThrA ThrA ThrA Ace Ace Number 60 40 95 5 10 90 str: gene involved in streptomycin resistance, aceA: gene involved in the use of acetate as a carbon source, thrA: gene involved in threonine biosynthesis. 1) What are the selective media used in these three transduction experiments? to obtain the selected…arrow_forward
- A conjugation-deficient strain of A. radiobacter is used to combat crown gall disease. Explain how this bacterium prevents the disease, and describe the advantage of using a conjugation-deficient strain.arrow_forwardConsider three genes in E. coli: thr+, ara+, and leu+ (which give the cell the ability to synthesize threonine, arabinose, and leucine, respectively). All three of these genes are close together on the E. coli chromosome. Phages are grown in a thr+ ara+ leu+ strain of bacteria (the donor strain). The phage lysate is collected and used to infect a strain of bacteria that is thr− ara− leu −. The recipient bacteria are then tested on selective medium lacking leucine. Bacteria that grow and form colonies on this medium (leu+ transductants) are then replica-plated on medium lacking threonine and on medium lacking arabinose to see which are thr+ and which are ara+. Another group of the recipient bacteria are tested on medium lackingthreonine. Bacteria that grow and form colonies on this medium (thr+ transductants) are then replica-plated on medium lacking leucine and onto medium lacking arabinose to see which are ara+ and which are leu+. Results from these experiments are as follows:…arrow_forwardAustin Taylor and Edward Adelberg isolated some new strains of Hfr cells that they then used to map several genes in Escherichia coli by using interrupted conjugation. In one experiment, the researchers mixed cells of Hfr strain AB‑312, which were xyl+ mtl+ mal+ met+ and sensitive to phage T6, with F− strain AB‑531, which was xyl− mtl− mal− met− and resistant to phage T6. The cells were allowed to undergo conjugation. At regular intervals, the researchers removed a sample of cells and interrupted conjugation by killing the Hfr cells with phage T6. The F− cells, which were resistant to phage T6, survived and were then tested for the presence of genes transferred from the Hfr strain. The results of this experiment are shown in the graph. On the basis of these data, give the order of the xyl, mtl, mal, and met genes on the bacterial chromosome and the minimum distances between them in minutes. The origin of transfer is represented by the red triangle. The distances between genes are not…arrow_forward
- By conducting conjugation experiments between Hfr and recipientstrains, Wollman and Jacob mapped the order of many bacterialgenes. Throughout the course of their studies, they identified severaldifferent Hfr strains in which the F-factor DNA had been integratedat different places along the bacterial chromosome. A sample of theirexperimental results is shown in the following table:Explain how these results are consistent with the idea that thebacterial chromosome is circular?arrow_forwardThe {choose } options are transformation, conjugation, or transduction.arrow_forwardDraw a diagram/figure to explain the conjugation process (e.g. use PowerPoint or draw one by hand and include a photo of it). You should include in the diagram the F- recipient, Hfr Donor and the transconjugant/recombinant recipient. Make sure to include the genes encoding for Leucine, Threonine, Thiamine and Streptomycin resistance in your diagram. How does an Hfr strain of coli transfers chromosomal DNA to an F- strain? What determines how much of the chromosomal DNA is transferred?arrow_forward
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