Domanda del libro di testo
Place the following in the order in which they are found in a host cell: (1) capsid proteins;
(2) infective phage particles; (3) phage nucleic acid.
a. 1, 2, 3
b. 3, 2, 1
c. 2, 1,3
d. 3, 1, 2
e. 1, 3, 2
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Ch. 13 - Viruses, Viroids, and Prions
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398
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TOC.tableOfContents
- Ch. 1 - The Microbial World and You18
- Ch. 2 - Chemical Principles20
- Ch. 3 - Observing Microorganisms Through a Microscope18
- Ch. 7 - The Control of Microbial Growth20
- Ch. 9 - Biotechnology & DNA Technology20
- Ch. 10 - Classification of Microorganisms15
- Ch. 11 - The Prokaryotes: Domains Bacteria and Archaea14
- Ch. 12 - The Eukaryotes: Fungi, Algae, Protozoa, and Helminths17
- Ch. 13 - Viruses, Viroids, and Prions20
- Ch. 14 - Principles of Disease and Epidemiology21
- Ch. 15 - Microbial Mechanisms of Pathogenicity19
- Ch. 16 - Innate Immunity: Nonspecific Defenses of the Host20
- Ch. 17 - Adaptive Immunity: Specific Defenses of the Host20
- Ch. 18 - Practical Applications of Immunology20
- Ch. 19 - Disorders Associated with the Immune System19
- Ch. 20 - Antimicrobial Drugs19
- Ch. 21 - Microbial Diseases of the Skin and Eyes21
- Ch. 22 - Microbial Diseases of the Nervous System19
- Ch. 23 - Microbial Diseases of the Cardiovascular and Lymphatic Systems20
- Ch. 24 - Microbial Diseases of the Respiratory System20
- Ch. 25 - Microbial Diseases of the Digestive System20
- Ch. 26 - Microbial Diseases of the Urinary and Reproductive Systems19
- Ch. 27 - Environmental Microbiology20
- Ch. 28 - Applied and Industrial Microbiology19
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Capitolo 9, Problema 7
Which of the following statements is false?
a. Viruses contain DNA or RNA.
b. The nucleic acid of a virus is surrounded by a protein coat.
c. Viruses multiply inside living cells using viral mRNA, tRNA, and ribosomes.
d. Viruses cause the synthesis of specialized infectious elements.
e. Viruses multiply inside living cells.
Guida verificata passo dopo passo1
Step 1: Understand the basic structure of viruses. Viruses contain either DNA or RNA as their genetic material, but not both simultaneously. This supports statement (a).
Step 2: Recognize that the nucleic acid of a virus is enclosed within a protein coat called a capsid, which protects the viral genome. This confirms statement (b).
Step 3: Analyze how viruses replicate. Viruses rely on the host cell's machinery, including ribosomes and tRNA, to translate viral mRNA into proteins. However, viruses do not have their own tRNA or ribosomes; they use the host's. This means statement (c) is partially incorrect because viruses do not contain their own tRNA and ribosomes.
Step 4: Consider the meaning of statement (d). Viruses cause the synthesis of viral components (proteins and nucleic acids) but not 'specialized infectious elements' as a separate entity. This statement is ambiguous and likely false because viruses themselves are the infectious elements.
Step 5: Confirm that viruses multiply inside living cells by hijacking the host's cellular machinery, which supports statement (e).
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Structure of Viruses
Viruses consist of genetic material, either DNA or RNA, enclosed within a protective protein coat called a capsid. This simple structure allows them to infect host cells and protect their nucleic acid from degradation.
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04:47
General Structure of Viruses
Viral Replication Mechanism
Viruses replicate by hijacking the host cell's machinery, using the host's ribosomes and enzymes to produce viral proteins and nucleic acids. However, viruses do not possess their own tRNA or ribosomes; they rely entirely on the host's components.
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05:12Persistent Viral Infections
Role of Viral mRNA and Infectious Elements
Viral mRNA is synthesized inside the host cell to direct the production of viral proteins. Viruses do not cause the synthesis of specialized infectious elements; rather, the virus itself is the infectious agent that assembles new viral particles within the host.
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03:29Acute Viral Infections
Pratica correlata
Domanda del libro di testo
The ability of a virus to infect an organism is regulated by
a. the host species.
b. the type of cells.
c. the availability of an attachment site.
d. cell factors necessary for viral replication.
e. all of the above
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Domanda del libro di testo
Recall from Chapter 1 that Koch's postulates are used to determine the etiology of a
disease. Why is it difficult to determine the etiology of
a. a viral infection, such as influenza?
b. cancer?
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Domanda del libro di testo
Plant viruses can’t penetrate intact plant cells because (a) ________; therefore, they enter cells by (b) ________. Plant viruses can be cultured in (c) ________.
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Domanda del libro di testo
Persistent viral infections such as (a) ________ might be caused by (b) ________ that are (c) ________.
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Domanda del libro di testo
Some antibiotics activate phage genes. MRSA releasing Panton-Valentine leukocidin is a toxin that can cause a life-threatening disease. Why can such a disease develop following antibiotic treatment?
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