Prescott's Microbiology
11th Edition
ISBN: 9781260409062
Author: WILLEY, Joanne
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 16.7, Problem 1MI
According to this model, what would happen if DNA that lacked homology to the S. pneumoniae chromosome were taken into the cell?
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Assume that there are horizontal gene transfers between two completely different bacterial species. In one case it is a plasmid that is transmitted via conjugation, in the other case it is it is a part of the bacterial chromosome that is transferred via transformation. In which of the two cases is it likely that the transferred DNA will be present? left and can function in the recipient cells? Explain the biological background to your answer
Suppose the experiment of Meselson and Stahl was performed on a sample of 8 cells, each containing one copy of its circular double-stranded DNA genome, and that had been growing on normal 14N medium. You then grew the cells for 3 generations in medium containing 15N. The outcome would be
A) 8 cells with single-stranded DNA molecules with 14N, and 24 cells with single-stranded DNA molecules with 15N. B) 16 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 48 cells with double-stranded DNA molecules with 15N. C) 8 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 24 cells with double-stranded DNA molecules with 15N. D) 8 cells with double-stranded DNA molecules with equal amounts of 14N and 15N, and 32 cells with double-stranded DNA molecules with 15N. E) 65 cells with single-stranded DNA molecules with 15N.
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Chapter 16 Solutions
Prescott's Microbiology
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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- In transformation, a bacterial cell takes up DNA fragments from its surroundings. The figure shows the process of natural transformation. Position the labels below with the correct images. (A) Donor and recipient genomes The donor strand is integrated into the recipient chromosome and the displaced bacterial DNA is degraded. A wild-type donor cell is in the vicinity of a double auxotroph. If the wild-type cell lyses, it releases DNA into the environment. One cell is identical to the original recipient, while the other carries the wild-type genes. A competent recipient cells a receptor site on its surface. One strand of donor DNA enters the cell and pairs with a homologous region of the bacterial chromosome The remaining DNA strand is degraded. A donor DNA strand binds to the receptor site. Reset trpC1 Wild-type donor cell Mechanism of natural transformation Donor DNA hal Receptor site- trpc/his double auxotroph Recipient cell Competent cell recipient -Bacterial chromosome (had.bpC") Ma…arrow_forwardWhich term among A-D is not correctly matched with its definition? A) O Slime layer: loose assemblage of polysaccharide material external to the cell envelope B) O Polysome or polyribosome formation: multiple ribosomes binding to a messenger RNA transcript C) O Replisome: two of these complexes working in opposite directions are needed to copy the bacterial chromosome D) O Nucleoid: cytoplasmic area containing the bacterial chromosome E) OA-D are all correctly matchedarrow_forwardThe genome of D. melanogaster consists of approximately 1.7 * 108 base pairs. DNA synthesis occurs at a rate of 30 base pairs per second. In the early embryo, the entire genome is replicated in five minutes. How many bidirectional origins of synthesis are required to accomplish this feat?arrow_forward
- Select the true statements: A.) It is possible, through genetic engineering, to fuse a fluorescent molecule (example GFP) with a non-fluorescent protein to create a fluorescent fusion protein. B.) Proteins are created during gene transcription. C.) It is possible to observe a fluorescent protein immediately after the plasmid coding for this protein is introduced into a cell. D.) The plasma coding for a fluorescent protein is also fluorescent. E.) It is possible to obtain a different color fluorescent fusion protein by replacing the sequence coding for the fluorescent protein in the plasmid for a sequence coding for a fluorescent protein by a different color sequence.arrow_forward35. If radioactive thymidine were introduced into the growth medium of actively dividing cells, it would be incorporated into the DNA molecule ... a) during the G1 phase when the cell does most of its growth. b) during S phase. c) as the cell passes the G1 Restriction Point. d) when centromeres split so the two chromosomes can be separated. e) at any point in the cell cycle.arrow_forwardWith respect to F+ and F- bacterial matings, (a) How was it established that physical contact was necessary? (b) How was it established that chromosome transfer was unidirectional? (c) What is the genetic basis of a bacterium being F+?arrow_forward
- If the recipient cell did not already have a lys− gene, could the lys+ DNA become incorporated into the bacterial chromosome? Explain.arrow_forwardA small section of Saccharomyces cerevisiae gene has the amino acid sequence valine, histidine, cysteine, and lysine. A mutation in the above section of the amino acid sequence resulted in the substitution of amino acid histidine with amino acid glutamine. The mutation in the antisense strand DNA of Saccharomyces cerevisiae gene described above involves a. the substitution of thymine base from GTG b. the deletion of second cytosine base from CAC c. the deletion of second guanine base from GTG d. the substitution of second cytosine base from CACarrow_forwardBelow is a diagram of the general structure of the bacteriophagel chromosome. Speculate on the mechanism by which it forms aclosed ring upon infection of the host cell. 5'GGGCGGCGACCT:double@stranded region-3' 3'- double@stranded region:CCCGCCGCTGGA5'arrow_forward
- Figure 3: Restrictrion site map showing the following: A) linear DNA that is not cut as reference B) DNA cut with BamHI, C) DNA cut with EcoRI, D) DNA cut with Hindlll 1. Calculate the size of the resulting fragments as they will occur after digestion and write the sizes on the maps below. Note that linear DNA has a total size of 48 502 bp A A DNA 10,000 20,000 30,000 40,000 48,502 (bp)arrow_forwardWhich of the following favors the alignment of chromosomes along the equatorial plate? a.)Centromere duplication b.)Pulling and pushing of the spindle fiber c.)The presence of centromere d.)The pair of aster at the beginning of cell divisionarrow_forwardIf we were to examine a strain with the F plasmid inserted into the same site of the bacterial chromosome, but in the reverse orientation: a) What would the order of gene transfer be? Include all of the genetic markers including the amino acid and nucleic acid metabolism genes and streptomycin resistance. b) What cell types would be able to grow on the NA vs ECM media types? Be sure to include the genotypes of the cells that would grow. Remember that NA provides all nutrients the bacteria needs + no antibiotic and HCM = minimal medium + glucose + has streptomycin antibiotic c) Would we still be able to perform our mapping? Why or why not? (Hint: refer to part b above)arrow_forward
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