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- A man was brought to the hospital showing "pneumonia"-like symptoms. They took the viral load and determined this to be the new RNA retrovirus infecting lung cells. Since antibodies were unavailable, doctors decided to treat him with drugs. Which of the following would most benefit the patient? A. Drug A is an inhibitor of the binding of 4OS with 60S ribosome of the lung cells. B. Drug B is a structural analogue of the viral peptide that binds to the receptor of the host cell enabling viral entry into the cell. C. Drug C is a polar molecule that inhibits the lytic enzymes activated upon viral infection. D. Drug D is an inducer of a proteolytic enzyme. E. Drug E is a steroid that binds at the regulatory site of a gene causing the synthesis of a repressor that binds at the gene site for the receptor.If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins (glycoproteins) during processing in the Golgi apparatus, which of the following processes is most likely to occur? O A. Viruses released by that host cell would have a decreased ability to infect cells than the virus that originally infected the cell. B. The virus-encoded protease would be unable to cleave large viral proteins into smaller, functional polypeptides. OC. The virus would be unable to replicate within the host cell. D. Viruses released by that cell are novel and would result in infections with higher mortality rates.Briefly describe how the Nucleocapsid protein of rabies virus promotes the switch from transcription to viral genomic replication.
- Finding drugs to treat viruses is far more challenging than finding drugs to treat bacteria. A. Why the difference? Ans: Viruses need a host cell to replicate and a bacteria needs food to continue to replicate. B. What can anti-viral drugs target in order to bring a viral infection under control, or to prevent a viral infection in the first place? Ans: To bring an infection under control you would want to inhibit protease so it could not break down the polypeptide protein chain down into new protein coats. C. What can anti-viral drugs target to prevent a viral infection in the first place? Ans: To prevent a viral infection in the first place you could take a medication that would alter the surface receptor, fill in the surface receptor or inhibits the viral surface protein all together. D. Offer 2 examples of drugs used to control viral infections (specify virus) and how do they work on different targets. Ans:…Viruses are host-specific, meaning they can only infect specific types of host organisms. For examble, the adenovirus is responsible for the common cold in humans but your dog can't catch a cold from you. Why is this? The proteins on the virus surface can only bind with proteins on the correct host surface. It is an enveloped or non-enveloped virus. The enzymes carried by the virus are compatible with the host. The genome of the virus is made of DNA or RNA.The structure of a prodrug used for treating people with HIV virus (human immunodeficiency virus) and AIDS is shown below. This molecule is a precursor of a protease inhibitor that competitively inhibits HIV protease due to its resemblance to the proteolytic site of the enzyme. Which process in the viral life cycle does this inhibitor target directly ? Group of answer choices a. viral protein processing for making new viruses b. viral mRNA synthesis c. viral DNA integration into the host cell DNA d. viral DNA synthesis
- Viruses may be latent for a long period of time. For example, HIV may be latent for many years, during which new viruses are not made. What are three different mechanisms of viral latency?The success of HAART (highly active antiretrovial therapy) against HIV is based on the idea that the probability of having an HIV virion that can simultaneously resist multiple anti-HIV drugs is very low. You were asked to investigate whether the same principle can be applied to another RNA virus, called Virus X. This is what you know about Virus X. (1) For a given antiviral drug, approximately 1 in 1,000 virions may carry a mutation that confers resistance against the said drug. (2) Roughly a total of 1010 virions can be found in an individual infected with Virus X. Assuming that all the drugs work independently of each other (i.e., mutations that allow resistance to one drug have no effect on the resistance to the other drugs), then minimally how many drugs are needed for this treatment regimen to work? Question 4 options: 1) 7 2) 6 3) 5 4) 4 5) 3If the HIV did not have a reverse transcriptase enzyme, then which of the following would apply? Select one: a. The virus can make use of the reverse transcriptase enzyme from the host cell to convert its RNA into DNA b. Viral particles will be produced without reverse transcriptase enzyme since the original HIV is an RNA virus and needs to assemble RNA ant coat proteins together c. The virus will manufacture its proteins from its RNA using translation and ribosomes from host cell d. Provirus will not be formed and assembly of viral particles will never occur e. The virus will not be able to recognise the host cell and therefore entry into the cell is blocked
- The 1918 influenza strain killed millions of people world-wide. After recovering the virus from preserved lung tissue and sequencing the genome, which of the scientific findings did NOT account for the viruses lethality in humans? The hemagglutination protein was associated with high lung damage. The virus came directly from birds, without first circulating in pigs. The virus was independent from a cellular protease for cell entry, and utilized neuraminidase instead. The virus came from bats.After a positive strand RNA virus ( Such as Coronaviruses) enters the host cell, the RNA is translated by ribosomes to create proteins associated with the virus (Such as, for example, the surface antigens like E and Spike proteins). How then, would the genetic material itself be replicated to be incorporated into the new viruses?.The 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 correct