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Biological Science Study Set 3

Biology

Quiz 33 :

Viruses

Quiz 33 :

Viruses

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img Figure 33.1 -Cells were infected with approximately 1000 copies of either virus A or virus B at the 0 time point. At 5- minute intervals, a sample of the virus and cell mixture was removed. The intact cells were removed from the sample, and the number of viruses per milliliter of culture was determined. Using the data in Figure 33.1, how long does it take for virus A to go through one lytic cycle?
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C

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When people die from HIV infections, it is usually because they
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D

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What is a significant difference between lytic and lysogenic viral growth?
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B

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If a viral host cell has a mutation that interferes with the addition of carbohydrates to proteins in the Golgi, which of the following could likely result?
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The first class of drugs developed to treat AIDS-such as AZT-were known as reverse transcriptase inhibitors. What was the mechanism by which they worked to treat HIV infections?
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What is difference between an epidemic and a pandemic?
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You just discovered a new virus. This virus infects heart muscle, where it causes inflammation. This virus has a very high mutation rate. Which of the following is the best strategy for finding a treatment for this virus?
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img Figure 33.1 -Which of the following statements applies to lysogeny?
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The HIV protease has been the target of several anti- HIV medications. This antiviral strategy is possible because
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What is the main structural difference between enveloped and nonenveloped viruses?
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img Figure 33.1 -Using the data in Figure 33.1, how long does it take for virus B to go through one lytic cycle?
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As obligate intracellular parasites, viruses have which of these characteristics?
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Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication that humans do not normally do. For example, humans normally do not have the ability to convert RNA into DNA. How can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires?
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HIV is inactivated in the laboratory after a few minutes of sitting at room temperature; the flu virus is still active after sitting for several hours. What are the practical consequences of these findings?
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In doing gene therapy, researchers frequently use attenuated viruses. The goal of gene therapy is to insert a normal copy of the mutated, disease- causing gene into the patient's genome, so that they will start producing normal protein. Which type of virus is suited to this application?
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Does treating a viral infection with antibiotics affect the course of the infection?
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Which of the following viruses would be the most likely to have reverse transcriptase?
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A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus TMV). The cell contents are left in a covered test tube overnight. The next day, this mixture is sprayed on tobacco plants. We expect that the plants would
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When HIV infects people, it does not immediately induce AIDS and kill its host. When people die from HIV infections, it is usually because
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Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single- stranded RNA genome containing about 6300 nucleotides. Its capsid is 25 -30 nanometres in diameter and contains 180 identical capsomeres. If the yellow mottle virus begins its infection of a cell by using its genome as mRNA, which of the following would you expect to be able to measure?
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