Microbiology Fundamentals: A Clinical Approach
3rd Edition
ISBN: 9781259709227
Author: Marjorie Kelly Cowan Professor, Heidi Smith
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 8, Problem 2Q
Using your knowledge of DNA from this chapter, imagine two different ways antibiotic resistance may develop in a bacterium.
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Imagine that you are a student in Alfred Hershey and Martha Chase’s lab in the late 1940s. You are given five test tubes containing E. Coli bacteria infected with T2 bacteriophages that have been labeled with either 32P or 35S. Unfortunately, you forget to mark the tubes and are now uncertain about which tubes is which. You performed their blender experiment and got the following results. Which tube out of these 5 contains E. Coli infected with 32P-labeled phage? Explain your answer.
In Hershey-Chase experiment, bacteriophages protein coats were tagged with radioactive isotope S-32. These phages were used to infect E. coli cells and the cells were further centrifuged to form pellets.
Why was the radioactivity level of S-32 found greater outside the cells compared to the E. coli cell pellets? Explain briefly.
If the experiment is repeated in the same manner but this time the phage protein coats are labelled with isotope X and the phage DNA with isotope Y, which isotope’s radioactivity will be found in greater amounts in the E. coli cell pellets after centrifugation? Explain briefly.
You are given two samples of DNA, one from Clostridium perfringens and the other from
Mycobacterium tuberculosis. Unfortunately, the labels on the tubes of DNA were accidentally
removed, and you do not know which DNA sample belongs to which organism. As you were
doing some work with Escherichia coli in the lab, you also have some of its DNA available as
well. The %G + %C values for each of the organisms is known (C. perfringens, 27%; M.
tuberculosis, 67%; E. coli, 50%). Based upon this information, how could you quickly
determine the source of the DNA for your two samples?
Chapter 8 Solutions
Microbiology Fundamentals: A Clinical Approach
Ch. 8.1 - Define the terms genome and gene.Ch. 8.1 - Differentiate between genotype and phenotype.Ch. 8.1 - Draw a segment of DNA, labeling all important...Ch. 8.1 - Summarize the steps of bacterial DNA replication,...Ch. 8.1 - Compare and contrast the synthesis of leading and...Ch. 8.1 - Prob. 1NPCh. 8.2 - Provide an overview of the relationship among DNA,...Ch. 8.2 - Identify important structural and functional...Ch. 8.2 - Draw a picture of the process of transcription.Ch. 8.2 - List the three types of RNA directly involved in...
Ch. 8.2 - Prob. 10AYPCh. 8.2 - Identify the locations of the promoter, the start...Ch. 8.2 - Indicate how eukaryotic transcription and...Ch. 8.2 - NCLEX PREP 2. The following are all true of RNA,...Ch. 8.2 - Prob. 3NPCh. 8.3 - Define the term operon, and explain one advantage...Ch. 8.3 - Prob. 14AYPCh. 8.4 - Prob. 15AYPCh. 8.4 - Prob. 16AYPCh. 8.5 - Prob. 17AYPCh. 8.5 - Differentiate among frameshift, nonsense, silent,...Ch. 8.5 - Prob. 19AYPCh. 8.5 - Prob. 1MMCh. 8.6 - Explain the importance of restriction...Ch. 8.6 - List the steps in the polymerase chain reaction.Ch. 8.6 - Describe how you can clone a gene into a...Ch. 8.6 - Prob. 23AYPCh. 8.6 - Prob. 24AYPCh. 8.6 - Name two genetic techniques that are designed to...Ch. 8.6 - NCLEX PREF 4. A client is being treated with...Ch. 8.6 - Prob. 2MMCh. 8 - Single nucleotide polymorphisms are found in a....Ch. 8 - Using your knowledge of DNA from this chapter,...Ch. 8 - Conduct research on CRISPR and explain in...Ch. 8 - Which of the following is a characteristic of RNA?...Ch. 8 - List some advantages and disadvantages to a cell...Ch. 8 - Construct an argument for why tRNA contains a lot...Ch. 8 - Prob. 7QCh. 8 - Discuss the intersection between the metabolome...Ch. 8 - Defend this statement: All of biology is dependent...Ch. 8 - DNA is semiconservative because the ______ strand...Ch. 8 - Examine the DNA triplets here and determine the...Ch. 8 - Prob. 12QCh. 8 - Prob. 13QCh. 8 - Prob. 14QCh. 8 - Metagenomics is providing insight into the...Ch. 8 - The creation of biological molecules and cells...Ch. 8 - Prob. 17QCh. 8 - Genetically modified organisms (GMOs)especially in...Ch. 8 - Prob. 19QCh. 8 - Construct an analogy using your clothes closet to...Ch. 8 - Prob. 21QCh. 8 - Prob. 1VC
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- Imagine that you are a student in Alfred Hershey and Martha Chase’s lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either 32P or 35S. Unfortunately, you forget to mark the tubes and are now uncertain about which were labeled with 32P and which with 35S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for the presence of radioactivity and obtain the following results. Which tubes contained E. coli infected with 32P-labeled phage? Explain your answer. Tube number Radioactivity present in 1 Cells 2 Protein coats 3 Protein coats 4 Cells 5 Cellsarrow_forwardImagine that you are a student in Alfred Hershey and Martha Chase’s lab in the late 1940s. You are given five test tubes containing E. coli bacteria infected with T2 bacteriophages that have been labeled with either 32P or 35S. Unfortunately, you forget to mark the tubes and are now uncertain about which were labeled with 32P and which with 35S. You place the contents of each tube in a blender and turn it on for a few seconds to shear off the phage protein coats. You then centrifuge the contents to separate the protein coats and the cells. You check for thepresence of radioactivity and obtain the following results. Which tubes contained E. coli infected with 32P-labeled phage? Explain your answer.arrow_forwardYou are a graduate student working to construct a single gene knockout library of Leptospiria kirschneri, one the causative agents of leptospirosis. You are looking for single gene mutants which disrupt the bacterium’s spirillum shape to determine what role this rare cellular morphology may play in disease development and progression. Using an appropriate donor strain, you introduce the plasmid shown into L. kirschneri. L. kirschneri is not able to replicate the plasmid. The repeat regions are denoted on the plasmid map as vertical black lines, the transposase is denoted as tnp, and kanamycin kinase is denoted as aph. The larger of the two regions is transposed. Following selection and counter-selection, you isolate several non-spirillum colonies, which you use to infect juvenile piglets. Most of the infected piglets develop leptospirosis. Isolating L. kirschneri from these animals reveals that it has regained its spirillum morphology. What is a likely explanation for this reversion of…arrow_forward
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