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- Which of the following is an example of virus-encoded molecules modifying signal transduction pathways to promote replication? Production of a small subgenomic RNA in flavivirus-infected cells Degradation of Xrn1 in poliovirus-infected cells Herpes simplex virus protein that blocks pre-mRNA splicing Poliovirus cleavage of nuclear export proteinsViruses with negative sense RNA genomes typically, make proteins by: (Ignore retroviruses, and the unusual characteristics of coronaviruses) Translation of short RNA transcripts generated by RDRP Generating a DNA copy, which is then transcribed by host RNA polymerase. Translation of the viral genome by host ribosomes. Production of a polyprotein, which must be cleaved into smaller proteins. Generating a negative sense genome copy, which is then translated by host ribosomes.Which of the following is an example of virus-encoded molecules modifying signal transduction pathways to promote replication? Group of answer choices Production of a small subgenomic RNA in flavivirus-infected cells Degradation of Xrn1 in poliovirus-infected cells Herpes simplex virus protein that blocks pre-mRNA splicing Poliovirus cleavage of nuclear export proteins
- Researchers studying the SARS-CoV-2 virus, also known as COVID-19, have found that the virus is able to circumvent its host cell's normal defenses by leaving the cell via its lyso- somes rather than its normal secretory vesicles, as illustrated in the figure below. endoplasmic reticulum nucleus disrupted lysosomal functions Entry and egress of the SARS-CoV-2 virus A Golgi complex Which of the following best explains their findings? B lysosome (deacidified) С lysosome (acidified) B-coronavirus normal biosynthetic pathway egress via lysosomal trafficking SARS-CoV-2 inhibits lysosomes of its host cells by decreasing the pH within them. SARS-CoV-2 activates lysosomes of its host cells by decreasing the pH within them. SARS-CoV-2 activates lysosomes of its host cells by increasing the pH within them. D SARS-CoV-2 inhibits lysosomes of its host cells by increasing the pH within them.‘’Viruses cannot be grown in standard microbiological culture such as broth and agar. They need to be cultured in the presence of a suitable host such as prokaryotic cells (easiest to grow in the lab), plants and animals because they are unable to reproduce independently in living cells’’.2.2 What are the changes that are brought by a virus to a cell? In your response, make reference to the cytopathic effect (CPE).The following events are those of RNA-directed RNA synthesis in Escherichia coli. Place the events in the correct sequence Recognition of the promoter region by the sigma subunit RNA polymerase binds to DNA The sigma subunit dissociates from the complex RNA polymerase catalyzes synthesis of RNA using the DNA as template
- Which of the following is a known characteristic that can lead to genetic changes in some viruses? Operons in the viral genome can undergo homologous recombination, leading to genetic rearrangements. Reassortment of segmented genomes can occur if a host cell is co-infected with two different viral strains. RNA polymerases used in replication of the viral genome have proofreading capability. Environmental conditions can trigger the SOS response, which triggers mutations in the viral genome.You are studying a new retrovirus. The viral protein (X) appears to play a role in the export of the viral genomes to the cytoplasm. Protein X brings viral DNA to the cytoplasm and returns back to the nucleus after genome export is complete. Researchers have developed a new drug for the virus. Following treatment with the new drug, the viral protein stays in the nucleus and cannot export the viral genomes. What is the most plausible and logical function of the drug? Use your knowledge of nuclear transport to answer this question. O A. The drug inhibits the binding of the viral protein and the viral genomes to the import receptor. B. The drug inhibits the binding of Ran-GTP to the nuclear export receptor in nucleus. C. The drug promotes the Ran GAP activity. D. The drug blocks the NLS on the viral protein.RNA polymerase in Escherichia coli normally synthesizes all of the following molecules except: RNA primers during DNA replication messenger RNA (mRNA) transfer RNA (tRNA) ribosomal RNA (rRNA) heterogenous nuclear RNA (hnRNA)
- What is the primary function of the N protein in the life cycle of the lambda bacteriophage? N protein participates in the integration of the viral genome into the host bacterium's chromosome N protein is responsible for viral attachment to the host bacterium N protein aids in the release of viral progeny from the host bacterium N protein is involved in the regulation of lysogenic and lytic pathwaysThe dUTPase enzyme is used by the African swine fever virus to repair its own DNA, as the cells the virus infects in swine do not express the dUTPase protein. Which of the following is a reasonable explanation for the role of the dUTPase in the virus lifecycle? Explain your choice in 25 words or less. The dUTPase is necessary to remove dUTP from the viral genome, as uracil should not be present in DNA The dUTPase is necessary to remove dUTP from the viral genome, as uridine cannot correctly base pair with adenine-containing bases The dUTPase is necessary to remove dUTP from the viral genome, as uridine has the wrong sugar component for building DNA More than one of the above answers is correct None of the above answers is correctHow are poly-adenosine tails added to subgenomic mRNAs of RNA viruses? Repeated uracil bases on the template cause the polymerase to slip backwards and recopy the sequence Polymerases copy a 200 base string of uracils found in some RNA viral genomes Polymerases copy a 200 base string of uracils added to the template during circularization Viral mRNAs undergo post-translational modifications, which include splicing of introns, a 5'-cap, and a 3'-poly-A tail