Microbiology: An Introduction (13th Edition)
13th Edition
ISBN: 9780134605180
Author: Gerard J. Tortora, Berdell R. Funke, Christine L. Case, Derek Weber, Warner Bair
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 4A
Prophages and proviruses have been described as being similar to bacterial plasmids. What similar properties do they exhibit? How are they different?
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As a general rule, viruses are not considered to be alive based on several reasons. One such reason is that some viruses use RNA as their genetic material instead of DNA. Which of the five biological themes does this violate? Briefly explain why.
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Which of the following is true about plasmids?a) They are present in all organismsb) They are present in bacteria onlyc) They are present in bacteria and phagesd) They are present in plants and animals
Chapter 13 Solutions
Microbiology: An Introduction (13th Edition)
Ch. 13 - Why do we classify viruses as obligatory...Ch. 13 - List the four properties that define a virus, what...Ch. 13 - Describe the four morphological classes of...Ch. 13 - Prob. 4RCh. 13 - Compare biosynthesis of a + stranded RNA and a ...Ch. 13 - Prob. 6RCh. 13 - Why is it difficult to determine the etiology of a...Ch. 13 - Prob. 8RCh. 13 - Plant viruses can be cultured in (c) __________.Ch. 13 - NAME IT Identify the viral family that infects...
Ch. 13 - Prob. 1MCQCh. 13 - The molecule serving as mRNA can be incorporated...Ch. 13 - Prob. 3MCQCh. 13 - Prob. 4MCQCh. 13 - An example of lysogeny in animals could be a. slow...Ch. 13 - The ability of a virus to infect an organism is...Ch. 13 - Which of the following statements is false? a....Ch. 13 - Prob. 8MCQCh. 13 - Prob. 9MCQCh. 13 - Prob. 10MCQCh. 13 - Discuss the arguments for and against the...Ch. 13 - In some viruses, capsomeres function as enzymes as...Ch. 13 - Why was the discovery of simian AIDS and feline...Ch. 13 - Prophages and proviruses have been described as...Ch. 13 - Prob. 1CAECh. 13 - A newborn female developed extensive vesicular and...Ch. 13 - Prob. 3CAE
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- Where do - ss RNA viruses assemble? O 1) golgi O 2) nucleus O3) cytoplasm O 4) both the nucleus and cytoplasm O 5) Endoplasmic reticulum Type:Sarrow_forwardHow can plasmids benefit humans?arrow_forwardArrange the following list into the correct sequence for part of the cycle of a retrovirus: 1. dsDNA integrated into host DNA 2.viral proteins synthesized on host ribosomes 3. viral DNA uses host enzymes to transcribe viral RNA 4. reverse transcriptase catalyzes synthesis of ssDNA 5. synthesis of second DNA strand (a) 5, 2, 1, 3, 4 (b) 5, 2, 3, 4, 1 (c) 4, 5, 1, 3, 2 (d) 4, 1, 2, 3, 5 (e) 2, 1, 3, 4, 5arrow_forward
- The properties that all plasmids share are that they1. all carry genes for antimicrobial resistance.2. are self-transmissible to other bacteria.3. always occur in multiple copies in the cells.4. code for non-essential functions.5. replicate in the cells in which they are found.a) 1, 2 b) 2, 3 c) 3, 4 d) 4, 5 e) 1, 5arrow_forwardAside from resistance to multiple antibiotics, what other physiologic or metabolic functions are associated with plasmid DNA? Search from the internet important use of plasmids in Genetics and Molecular Biology? How do viruses and bacteria differ in terms of their genetic material?arrow_forwardWhy are plasmids dangerous?arrow_forward
- The genome of which of the following types of animal virus can act directly as MRNA and be utilized by ribosomes without prior processing? O 1) retroviruses O 2) SSDNA viruses 3) -SSRNA viruses O 4) +SSRNA viruses 5) dsDNA virusesarrow_forwardWhy must primary cell cultures be restarted every so often when preparing primary cell cultures to observe morphological changes caused by cells infected by a virus? Why are tumor cells preferred? Why are non-enveloped viruses generally more resistant to disinfectants than are enveloped viruses? A public health physician isolated large number of phages from rivers used as a source of drinking water in western Africa. They physician is very concerned that humans might become ill from drinking this water, although she knows that the phages specifically attack bacteria. Why is she concerned?arrow_forwardA) A bacterium that has an F plasmid is able to do which of the following? Group of answer choices resist antibiotics survive in very harsh environments such as hypersaline lakes grow a cell wall form conjugation tubes and pass on their DNA to other bacteria reproduce sexually B) horizontal gene transfer refers to bacteria's ability to Group of answer choices make peptidoglycan for their cell walls transfer DNA to offspring, or "daughter" cells transfer DNA only when on horizontal surfaces, such as a table top transfer pieces of DNA to other cells in the population engage in mutualisms with certain speciesarrow_forward
- Some retroviruses that have a wide host range have been developed for use in treatment of diseases or syndromes. These viruses do not result in a productive infection because they lack critical genes for viral replication, but they do carry DNA sequences that allow them to be packaged into infectious particles. Once in the host cell the viral DNA is released and integrates into the cell's genome. The advantage to this strategy is that the delivery of the DNA is very efficient. What is one possible problem of using a virus that can integrate into the human nuclear genome? Multiple Choice The virus carries genes that will interfere with host cell activities. The viral DNA sequences could still cause a disease. Since the viral DNA sequences no longer contain essential genes for viral replication the host cell may not be able to replicate either. The integration could disrupt an essential gene or genes.arrow_forwardWhich of the following statements is true about a vector?a) Plasmids, phages can be used as vectorsb) All vectors are plasmidsc) Cyanobacteria can also be used as vectorsd) Fungi can also be used as vectorsarrow_forward27. Class VI animal viruses include HIV, Based on the type of viral genome, how is this class distinguished from the other classes of animal virus? A) It has double stranded RNA. B) It has single stranded RNA that serves as mRNA (positive sense). C) It has single stranded RNA that serves as a template for the synthesis of DNA. D) It has single stranded RNA that serves as a template for mRNA (anti-sense). does HIVarrow_forward
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