Why is the study of viruses not as important as classification?
It is not as important as classifying organisms since they are not living entities D. It provides a useful way to identify and study viruses C. It is not as important as classifying organisms since they are not living entities
When are all the viral genes usually expressed in viral infections?
T or F In viral infections, all of the viral genes are usually expressed prior to the replication of viral nucleic acid. ... 170. Which of the following represents ways in which animal viruses damage their host cells?
What does a particular virus' genetic material first need to be copied?
A particular virus' genetic material first needs to be copied into positive sense SS-RNA (Single Strand RNA). What type of virus is this? The lysogenic cycle is different from the lytic cycle in that the _____. A. The phage DNA is incorporated into host cell DNA--correct B. The cell bursts during release D.
What nucleic acids do viruses usually consist of?
45. The nucleic acids carried by viruses usually consist of D. both DNA and RNA simultaneously. 47. Most important character in viral classification is: Viruses with single-stranded RNA as their genome for which the base sequence is the same as the viral mRNA are said to be __________ viruses.
What is the most common viral cause of epidemic gastroenteritis worldwide?
Pneumocystis jirovecii. Creutzfeldt-Jakob disease (CJD) is a rapidly progressive, invariably fatal neurodegenerative disorder believed to be caused by an abnormal isoform of a cellular glycoprotein known as the. PrPSC. Most common viral cause of epidemic gastroenteritis worldwide.
What is cross reactivity with T-lymphotropic virus type 1?
cross-reactivity with human T-lymphotropic virus type 1. (D) A major problem with testing for antibody to the virus is its. cross-reactivity with human T-lymphotropic virus type 1. These antiviral agents are often referred to as the 'backbone' of antiretroviral therapy (ART) regimens and are usually given in pairs.
Can viruses cause cancer?
Viruses can cause cancer in animals and humans. A principle. of viral carcinogenesis is that. Not all infections with a human cancer virus lead to tumor. formation. Cellular oncogenes represent activated genes involved in cancer. A second class of cancer genes is involved in cancer development.
Is CD4 a coreceptor?
CD4 as well as a coreceptor, either CCR5 on macrophages (early infection), or CXCR4 on T cells (late infection) Suitable virus for bioterrorism: H5N1. Species of Ebola virus caursing recent 2014 outbreak in West Africa: Zaire ebolavirus.
Is latency correct for herpes?
Each of the following statements concerning herpesvirus. latency is correct except. (A) Exogenous stimuli can cause reactivation of latent infection, with induction of symptomatic disease. (B) During latency, antiviral antibody is not demonstrable in. the sera of infected individuals.
What causes lysis of host cells?
B. Strong viral replication causing lysis of host cells. This can lead to a disease state shortly after infection, which is steadily eliminated by the host's immune responses. Long-term immunity is usually present after the infection is cleared.
Can C. coli mimic proto-oncogenes?
C. can mimic proto-oncogenes, causing imbalance in cell cycle control towards unchecked proliferation, leading to tumor formation. After beta phage infects Corynebacterium diphtheriae and integrates its DNA into the host genome, the bacterium is capable of causing the disease diphtheria.
Is MM1-1998 a phenotype?
C. MM1- 1998 affected genotype but not phenotype of the S. pneumoniae. D. Lysogenized S. pneumoniae is immune to infection by other strains of MM1. Immunity to superinfection (infection of a cell at a later time with a second, identical bacteriophage) is a consequence of lysogeny.
How do viruses cause disease?
c. Bacteria cause disease by incorporating their DNA into the host's DNA, and viruses cause disease by incorporating their RNA in the host's RNA. d.
What is the function of bacteria in the body?
Bacteria are living cells that grow and reproduce in the body and produce toxins or damage tissues they grow in . Viruses use host cells to reproduce, and these host cells usually die when newly produced virus particle are released. 13.
What is the name of the woman who has a fever, a cough, and a head ache?
Amantadine. A63-year-old woman is hospitalized for treatment of leukemia. One day a er admission she develops chills, fever, cough, head- ache, and myalgia. She states that her husband had a similar illness a few days earlier. ere is major concern about a respiratory virus outbreak in the staff of the chemotherapy ward and in the patients on ...
Can poliovirus be produced by both MutX and MutY?
occur and both MutX and MutY viruses produced. Two mutants of poliovirus have been isolated, one (MutX) with a mutation in gene X and the second (MutY) with a mutation in gene Y. If cells are infected with each mutant alone, no virus is produced. If a cell is coinfected with both MutX and MutY,