Skip to main content
Ch. 19 - Viruses
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 11th EditionCh. 19 - VirusesProblema 6
Capitolo 19, Problema 6

Redraw Figure 19.8 to show the replicative cycle of a virus with a single-stranded genome that can function as mRNA (a class IV virus).

Guida verificata passo dopo passo
1
Begin by drawing the virus particle, which includes a protein coat (capsid) surrounding a single-stranded RNA genome. Label this as the 'Class IV virus'.
Illustrate the virus attaching to a host cell. This is typically shown by the virus binding to specific receptors on the host cell's surface.
Depict the entry of the viral RNA into the host cell. This can occur through direct injection or endocytosis, where the virus is engulfed by the cell membrane.
Show the viral RNA being used directly as mRNA by the host cell's ribosomes. This step involves the translation of viral proteins necessary for replication and assembly.
Finally, illustrate the assembly of new virus particles within the host cell. The newly synthesized viral RNA and proteins come together to form new virions, which are then released from the host cell to infect other cells.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
38s

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Class IV Virus

Class IV viruses are single-stranded RNA viruses whose genomes can directly function as mRNA. This means that upon entering a host cell, their RNA can be immediately translated by the host's ribosomes into viral proteins, facilitating rapid replication and infection processes.
Video consigliato:
00:52
Classes of Signaling Receptors

Viral Replicative Cycle

The viral replicative cycle involves several stages: attachment, entry, replication, assembly, and release. For a Class IV virus, the cycle begins with the virus attaching to the host cell, followed by entry where the viral RNA is released into the cytoplasm, serving as mRNA for protein synthesis, leading to the assembly of new virions and their release from the host cell.
Video consigliato:
13:59
Viral Genetics

mRNA Functionality

mRNA, or messenger RNA, is crucial for protein synthesis as it carries genetic information from DNA to ribosomes, where it is translated into proteins. In the context of Class IV viruses, the viral RNA itself acts as mRNA, bypassing transcription and directly engaging the host's ribosomal machinery to produce viral proteins necessary for replication.
Video consigliato:
06:04
Functional Groups
Pratica correlata
Domanda del libro di testo

RNA viruses require their own supply of certain enzymes because

a. Host cells rapidly destroy the viruses.

b. Host cells lack enzymes that can replicate the viral genome.

c. These enzymes translate viral mRNA into proteins.

d. These enzymes penetrate host cell membranes.

2274
views
Domanda del libro di testo

To cause a human pandemic, the H5N1 avian flu virus would have to

a. Spread to primates such as chimpanzees.

b. Develop into a virus with a different host range.

c. Become capable of human-to-human transmission.

d. Become much more pathogenic.

1382
views
Domanda del libro di testo

A bacterium is infected with an experimentally constructed bacteriophage composed of the T2 phage protein coat and T4 phage DNA. The new phages produced would have

a. T2 protein and T4 DNA.

b. T4 protein and T2 DNA.

c. T2 protein and T2 DNA.

d. T4 protein and T4 DNA.

2387
views