Microbiology: An Introduction
12th Edition
ISBN: 9780321929150
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case
Publisher: PEARSON
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Textbook Question
Chapter 8, Problem 2A
Replication of the E. coli chromosome takes 40 to 45 minutes, but the organism has a generation time of 26 minutes. How does the cell have time to make complete chromosomes for each offspring cell?
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Chapter 8 Solutions
Microbiology: An Introduction
Ch. 8 - Briefly describe the components of DNA, and...Ch. 8 - DRAW IT Identify and mark each of the following on...Ch. 8 - Match the following examples of mutagens. Column A...Ch. 8 - The following is a code for a strand of DNA. a....Ch. 8 - Identify when (before transcription, after...Ch. 8 - Which sequence is the best target for damage by UV...Ch. 8 - You are provided with cultures with the following...Ch. 8 - Why are mutation and recombination important in...Ch. 8 - NAME IT Normally a commensal in the human...Ch. 8 - Match the following terms to the definitions in...
Ch. 8 - Match the following terms to the definitions in...Ch. 8 - Feedback inhibition differs from repression...Ch. 8 - Bacteria can acquire antibiotic resistance by all...Ch. 8 - Suppose you inoculate three flasks of minimal...Ch. 8 - Plasmids differ from transposons in that plasmids...Ch. 8 - Mechanism by which the presence of glucose...Ch. 8 - The mechanism by which lactose controls the lac...Ch. 8 - Two offspring cells are most likely to inherit...Ch. 8 - Which of the following is not a method of...Ch. 8 - Nucleoside analogs and ionizing radiation are used...Ch. 8 - Replication of the E. coli chromosome takes 40 to...Ch. 8 - Pseudomonas has a plasmid containing the mer...Ch. 8 - Ciprofloxacin, erythromycin, and acyclovir are...Ch. 8 - HIV, the virus that causes AIDS, was isolated from...Ch. 8 - Human herpesvirus-8 (HHV-8) is common in parts of...
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- How do the linear chromosomes in eukaryotes ensure that its ends are replicated completely?arrow_forwardHow does DNA replication occur in a precise manner to ensure that identical genetic information is put into the new chromatid? See Figures 8.12 and 8.13. FIGURE 8.12 In DNA replication, the two polynucleotide strands uncoil, and each is a template for synthesizing a new strand. A replicated DNA molecule contains one new strand and one old strand. This mechanism is called semiconservative replication. FIGURE 8.13 A close-up look at the process of DNA replication. (a) As the strands uncoil, bases are added to the newly synthesized strand by complementary base pairing with bases in the template strand. The new bases are linked together by DNA polymerase. (b) DNA synthesis can proceed only in the 5 3 direction; newly synthesized DNA on one template strand is made in short segments and linked together by the enzyme DNA ligase.arrow_forwardWhy is it important for a chromosome to be copied before mitosis?arrow_forward
- E. coli is severely exposed to UV light and is DNA damaged, but it attempts to replicate its genome. The prophage gets the signal to leave its host’s genome. The ungrateful phage not only leaves its host but lyses it as it leaves. What type of damage will the UV light cause to the E. coli? E. coli can attempt to replicate its damaged genome. What is the name of this type of DNA replication? What is the name of the response that replicates damaged DNA in E. coli? Which is one of the proteins involved in this response? Explain the events leading to the excision of the lambda prophage from the damaged E. coli, specifically, excision from the host’s genome.arrow_forwardSuppose that E. coli synthesizes DNA at a rate of 100,000 nucleotides per minute and takes 40 minutes to replicate its chromosome. (a) How many base pairs are present in the entire E. coli chromosome? (b) What is the physical length of the chromosome in its helical configuration—that is, what is the circumference of the chromosome if it were opened into a circle?arrow_forwardAs shown, telomerase attaches additional DNA, six nucleotides at a time, to the ends of eukaryotic chromosomes. However, it makes only one DNA strand. Describe how the opposite strand is replicated.arrow_forward
- The amount of DNA in eukaryotic cells is significantly greater than in prokaryotes. With this in mind, how is the eukaryotic DNA replicated in a timely, synchronous fashion?arrow_forwardWhat result demonstrated that the spindles shorten at the chromosome end during anaphase? Group of answer choices a) The stained region of the microtubules didn’t move b) The stained region of the microtubules moved away from the chromosome c) The stained region of the microtubules stayed the same size d) The stained region of the microtubules moved towards the chromosome e) The stained region of the microtubules got largerarrow_forward3) Examine the graph showing the relative percentage normal and cancer cells spend in various stages of the cell cycle. Based on the information in the graphs, infer how cancer cells differ from typical, noncancerous cells. Select ALL that apply. A) Cancer cells do not replicate their DNA. B) Cancer cells replicate their DNA too quickly. C) Cancer cells do not go through interphase during their cell cycle. D) Cancer cells spend more time dividing compared to typical cells. E) Cancer cells do not always grow to the same size as typical cells. more than 1 answer. not gradedarrow_forward
- How do we know that DNA replication occurs during inter-phase, not early in mitosis?arrow_forwardIf DnaA was not regulated in Escherichia coli and multiplerounds of replication were completed before cell division,what would be the consequence to the daughter cell and why?Would the resulting cell still be considered haploid?arrow_forwardwhy is it more advantageous for the cell to have its DNA fused to the cell wall as opposed to dispersed freely in the cell?arrow_forward
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