Domanda del libro di testo
List the four properties that define a virus. What is a virion?
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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 3
A virus with RNA-dependent RNA polymerase
a. synthesizes DNA from an RNA template.
b. synthesizes double-stranded RNA from an RNA template.
c. synthesizes double-stranded RNA from a DNA template.
d. transcribes mRNA from DNA.
e. none of the above
Guida verificata passo dopo passo1
Step 1: Understand the function of RNA-dependent RNA polymerase (RdRp). This enzyme synthesizes RNA from an RNA template, which is a key feature of certain RNA viruses.
Step 2: Analyze each option in the context of RdRp activity: (a) synthesizes DNA from RNA template - this describes reverse transcriptase, not RdRp.
Step 3: Consider option (b) synthesizes double-stranded RNA from an RNA template - this matches the activity of RdRp, which can create complementary RNA strands to form double-stranded RNA.
Step 4: Evaluate options (c) and (d): (c) synthesizes double-stranded RNA from DNA template - this is incorrect because RdRp uses RNA, not DNA, as a template; (d) transcribes mRNA from DNA - this is the role of DNA-dependent RNA polymerase, not RdRp.
Step 5: Conclude that the correct description of RNA-dependent RNA polymerase activity is option (b), synthesizing double-stranded RNA from an RNA template.
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RNA-dependent RNA polymerase (RdRp)
RNA-dependent RNA polymerase is an enzyme used by RNA viruses to replicate their RNA genomes. It synthesizes a complementary RNA strand using an RNA template, enabling the production of new viral RNA. This enzyme is essential for RNA virus replication but is not involved in DNA synthesis.
Video consigliato:
04:19
1) RNA Processing
RNA virus replication mechanisms
RNA viruses replicate their genomes by synthesizing RNA from RNA templates, often producing double-stranded RNA intermediates. This process differs from DNA viruses, which use DNA-dependent enzymes. Understanding this mechanism helps distinguish how viral RNA is copied and how mRNA is produced for protein synthesis.
Video consigliato:
01:30Animal Viruses: RNA Virus Synthesis & Replication
Transcription and reverse transcription
Transcription typically refers to synthesizing RNA from a DNA template, while reverse transcription involves making DNA from an RNA template. RNA-dependent RNA polymerase does not perform these functions; instead, it synthesizes RNA from RNA, distinguishing it from DNA-dependent RNA polymerase and reverse transcriptase.
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04:16Initiation of Transcription
Pratica correlata
Domanda del libro di testo
Describe the four morphological classes of viruses, then diagram and give an example of each.
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Domanda del libro di testo
Which of the following would be the first step in the biosynthesis of a virus with reverse transcriptase?
a. A complementary strand of RNA must be synthesized.
b. Double-stranded RNA must be synthesized.
c. A complementary strand of DNA must be synthesized from an RNA template.
d. A complementary strand of DNA must be synthesized from a DNA template.
e. None of the above
1028
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Domanda del libro di testo
Place the following in the most likely order for biosynthesis of a bacteriophage: (1) phage lysozyme; (2) mRNA; (3) DNA; (4) viral proteins; (5) DNA polymerase.
a. 5, 4, 3, 2, 1
b. 1, 2, 3, 4, 5
c. 5, 3, 4, 2, 1
d. 3, 5, 2, 4, 1
e. 2, 5, 3, 4, 1
885
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Domanda del libro di testo
Label the principal events of attachment, biosynthesis, entry, and maturation of a + stranded RNA virus. Draw in uncoating.
1233
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Domanda del libro di testo
The molecule serving as mRNA can be incorporated in the newly synthesized virus capsids of all of the following except
a. + strand RNA picornaviruses.
b. + strand RNA togaviruses.
c. - strand RNA rhabdoviruses.
d. double-stranded RNA reoviruses.
e. Rotavirus.
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