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.

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.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter24: Viruses And Subviral Agents

Section: Chapter Questions

Problem 10TYU: Arrange the following list into the correct sequence for part of the cycle of a retrovirus: 1. dsDNA...

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Which of the following is a known characteristic or procesds that can lead to genetic changes in some viruses? When two different viral strains of the same type of virus infect a single individual, reassortment/mixing of segmented genome pieces can occur, resulting in new combinations of segments. Genetic rearrangements of the viral genome occurs as a result of duplicate operons in the viral genome undergoing homologous recombination. Environmental conditions trigger the SOS response in viruses, and leads to generation of errors/mutations in the viral genome. Viral RNA polymerases display proofreading capability in replicating the viral genome of certain viruses.
Which of the following models best depicts how the genetic information in a retrovirus is eventually translated into proteins? A) DNA in the retrovirus → RNA in the host cell → Proteins B) RNA in the retrovirus → DNA in the host cell → RNA in the host cell → Proteins C) RNA in the retrovirus → mRNA in the host cell → Proteins D) DNA in the retrovirus → mRNA in the host cell → Proteins
Assume you isolate a single stranded (+) RNA virus. When you examine the proteins in the virus, you find that it does NOT contain replicase enzymes within its capsid. Which of the following is true? This virus must have a gene that encodes replicase. This virus will not be able to enter a host cell. Its genome cannot be translated (the process of translation) by the host cell ribosomes. A DNA copy of the viral genome has to be made before viral genes are expressed. This virus must lack surface antigens.
For the mutations described below, categorize them in each of the following ways: [transition, transversion, insertion, or deletion]; [synonymous, missense, nonsense, frameshift, or regulatory]; [beneficial, deleterious, or neutral] A mutation in the SARS-CoV2 virus changes a codon in the gene encoding the spike protein from AAG to AAC. This mutation increases the ability of the virus to spread from person to person. Becker muscular dystrophy results in progressive wasting of skeletal and heart muscle tissue. A patient is found to have a mutation in the dystrophin gene (DMD) in the first nucleotide of intron 25. Normally, a G is in this position, but the patient has an A. Fur color in house cats is affected by several genes that encode pigment-producing enzymes. One such gene is found to have an additional C after position 45 in orange cats but not in black cats.
Viruses are made up of the same biomolecules as cellular organisms (DNA, RNA, proteins, lipids, etc.), which are synthesized through enzymatic dehydration reactions from building blocks and disassembled by enzymatic hydrolysis. They infect cells and replicate themselves using resources from the host cells. Scientists discovered a previously unknown strain of virus in the tropical Pacific Ocean and it can infect higher-order eukaryotes. Initial analysis revealed that the virus is mainly composed of nucleic acids, proteins, and lipids. Chemical analysis after complete hydrolysis revealed the following building blocks (by weight): Chemical components Nucleosides Amino acids Lipids, phosphates, and carbohydrates Percentage by weight 20 30 50 Analysis of percentages of nucleosides yielded the following results (by molar ratio): Nucleosides A G T C U Percentage by mole 19 29 19 29 4 Which of the following events mostly involves hydrolysis reaction after the virus infects…
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 proteins
A viral mutation that causes changes in the glycoprotein spikes would affect which aspect of the virus? The virus would become lysogenic and incorporate its genome into the host cell genome. The virus would enter the host by a combination of endocytosis and fusion. The virus would lose its viral envelope and become a naked virus. The virus would adsorb to different host cells and its host range would be altered. The viral genome would not require uncoating once inside the host cell.
For the mutations described below, categorize them in each of the following ways: [transition, transversion, insertion, or deletion]; [synonymous, missense, nonsense, frameshift, or regulatory]; [beneficial, deleterious, or neutral] a. A mutation in the SARS-CoV2 virus changes a codon in the gene encoding the spike protein from AAG to AAC. This mutation increases the ability of the virus to spread from person to person. b. Becker muscular dystrophy results in progressive wasting of skeletal and heart muscle tissue. A patient is found to have a mutation in the dystrophin gene (DMD) in the first nucleotide of intron 25. Normally, a G is in this position, but the patient has an A. c. Fur color in house cats is affected by several genes that encode pigment-producing enzymes. One such gene is found to have an additional C after position 45 in orange cats but not in black cats.
A viral mutation that causes changes in the glycoprotein spikes would affect which aspect of the virus? The virus would become lysogenic and incorporate its genome into the host cell genome. The virus would enter the host by a combination of endocytosis and fusion. The virus would lose its viral envelope and become a naked virus. The virus would attach to different host cells and its host range would be altered. The viral genome would not require uncoating once inside the host cell.
Which of the following is NOT a feature of genetic reassortment? A) a host cell is coinfected with two different viruses B) different segments of multipartite genomes are mixed C) host range is permanently altered D) two different viruses have nonidentical but overlapping host ranges E) viruses released possess genetic material from two “parent” viruses F) ALL of these are features of genetic reassortment
A virus (bacteriophage) attaches to a host bacterial cell, inserts the viral DNA into the cell. Right away, the DNA from the virus is is replicated, and synthesis of viral components occurs in the cytoplasm. Which of the following describes what is occurring here? A lytic cycle of bacteriophage replication. Entry to the lysogenic cycle. Horizontal gene transfer. Integration of a prophage into the host genome.
Coronaviridae is a virus “family.” There are actually many different coronaviruses within this group, including less pathogenic virus strains that cause the common cold. Many people in this course have likely been infected with one of these other coronaviruses. A common feature of coronaviruses and other RNA viruses (think influenza virus, HIV, etc.) is that they mutate frequently. This is because the viral enzymes that copy the genome during replication can’t fix mistakes. Given this information, how might we be able to distinguish the SARS-CoV-2 strain from some of the other, less concerning, coronavirus strains?

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		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.