Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 12, Problem 3PDQ
Contrast the size of the single chromosome in bacteriophage λ and T2 with that of E. coli. How does this relate to the relative size and complexity of phages and bacteria?
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Chapter 12 Solutions
Concepts of Genetics (12th Edition)
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- The 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_forwardHow does recombination in bacteria differ from recombination in eukaryotes? 1) Recombination does not occur in prokaryotes 2) Only the plasmid DNA goes through recombination in prokaryotes 3) Sister chromatids, not homologous chromosomes, exchange information during recombination in prokaryotes 4) A portion of DNA from genome is replaced with homologous DNA from another strain of bacteria.arrow_forwardContrast the sizes of the chromosomes of bacteriophage l and T2with that of E. coli, and compare the appearance and size of theDNA associated with mitochondria and chloroplasts.arrow_forward
- outline the sequence of events that comprise the mechanism used by a bacteriophage in order to infect a bacteria cell.arrow_forwardWhat is horizontal gene transfer? What are the three mechanisms for this to occur in bacteria? What are the components needed for the processes of transformation, conjugation, and transduction? How does each process occur? What genes are involved in each process? How do generalized and specialized transduction differ? What is the end result of each? What is recombination? What is the importance to bacteria & archaea? What are the two types of recombination? What are the details of each type? What components are needed for each type?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
- Bacterial conjugation has medical consequences. For example, certain plasmids contain genes that code for toxins. The causative agent of a deadly form of food poisoning, E. coli 0157, synthesizes a toxin that causes massive bloody diarrhea and kidney failure. This toxin is now believed to have originated in Shigella, another bacterium that causes dysentery. Similarly, the growing problem of antibiotic resistance is partly attributable to the spread of antibioticresistant genes among bacterial populations. Antibiotic resistance develops because antibiotics are overused in medical practice and in livestock feeds. Suggest a mechanism by which this extensive use promotes antibiotic resistance.arrow_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_forwardWhich of the following statements is false? a) the bacterial chromosome is usually circular b) the bacterial chromosome has a single origin of replication c) the bacterial chromosome consists of a single molecule of DNA d) plasmids are small DNA molecules that occur in bacteria but are not essential - for normal function. e) Most bacterial genomes consist of fewer than 1,000 genesarrow_forward
- Which of the following is NOT a mechanism by which plasmids inerease the possibility of being present in the new generation of cells? A) O They can be present at a high number so that some copies will end up in each new cell after cell division. B) O They encode traits such as antibiotic resistance that are required for growth in some environments. C) O They cause the cell to replicate much more rapidly than cells that do not have plasmids. D) O They may carry host survival genes and self-preservation genes.arrow_forwardBacterial cells were coinfected with two types of bacteriophage lambda: One carried the c+ allele and theother the c allele. After the cells lysed, progeny bacteriophage were collected. When a single such progeny bacteriophage was used to infect a new bacterialcell, it was observed in rare cases that some of theresulting phage progeny were c+ and others were c.Explain this result.arrow_forwardThe genes for both the α- and βglobin chains of hemoglobin contain introns (i.e., they are split genes). How would this fact affect your plans if you wanted to introduce the gene for α-globin into a bacterial plasmid and have the bacteria produce α-globin?arrow_forward
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Bacterial Genomics and Metagenomics; Author: Quadram Institute;https://www.youtube.com/watch?v=_6IdVTAFXoU;License: Standard youtube license