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Ch. 13 - Viruses, Viroids, and Prions
Tortora - Microbiology: An Introduction 14th Edition
Tortora14th EditionMicrobiology: An IntroductionISBN: 9780138200398Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTortora 14th EditionCh. 13 - Viruses, Viroids, and PrionsProblema 1
Capitolo 9, Problema 1

Why do we classify viruses as obligatory intracellular parasites?

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Understand the term 'obligatory intracellular parasite': it refers to an organism that must live and reproduce inside the cells of a host because it cannot carry out essential life processes on its own.
Recognize that viruses lack the cellular machinery necessary for independent metabolism and reproduction, such as ribosomes for protein synthesis and enzymes for energy production.
Note that viruses rely entirely on the host cell's machinery to replicate their genetic material and produce new viral particles.
Consider that because viruses cannot generate energy or synthesize proteins independently, they must enter a host cell to hijack its systems for replication.
Conclude that this dependence on living host cells for reproduction and survival is why viruses are classified as obligatory intracellular parasites.

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Obligate Intracellular Parasites

Obligate intracellular parasites are organisms that can only reproduce and carry out metabolic processes inside the living cells of a host. Viruses lack the cellular machinery needed for independent life, making them dependent on host cells for replication.
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Viruses

Virus Structure and Replication

Viruses consist of genetic material (DNA or RNA) enclosed in a protein coat and sometimes a lipid envelope. They replicate by injecting their genetic material into host cells, hijacking the host's machinery to produce new viral particles.
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Animal Viruses: RNA Virus Synthesis & Replication

Host Dependency for Metabolism

Unlike cellular organisms, viruses do not have metabolic pathways or energy production systems. They rely entirely on the host cell's metabolic processes to synthesize proteins and nucleic acids necessary for their propagation.
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Introduction to Metabolism
Pratica correlata
Domanda del libro di testo

List the four properties that define a virus. What is a virion?

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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

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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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