BIO 205- Chapter 13 Viruses, Viroids and Prions
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| Place the following in the most likely order for biosynthesis: 1. Phage lysozyme 2. mRNA 3. DNA 4. viral proteins 5. DNA polymerase | 2,5,3,4,1
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| The molecule serving as mRNA can be incorporated in the newly synthesized virus capsids of all the following except: | -Strand RNA rhabdoviruses
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| A virus with RNA-dependent RNA polymerase: | Synthesizes double-stranded RNA from an RNA template.
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| Which of the following would be the first step in the biosynthesis of a virus with reverse transcriptase? | A complementary strand of DNA must be synthesized from an RNA template
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| An example of lysogeny in animals could be: | Latent viral infections
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| The ability of a virus to infect an organism is regulated by: | the host species, the type of cells, the availability of an attachment site, and cell factors necessary for viral replication
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| Place the following in the order in which they are found in a host cell: 1. capsid proteins 2. infective phage particles 3. phage nucleic acid | 3, 1, 2
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| Which of the following does not initiate DNA synthesis? | A single stranded RNA virus (Togaviridae)
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| A viral species is not defined on the basis of the disease symptoms it causes. The best example of this is: | Hepatitis
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| In which of the following ways do viruses differ from bacteria? | Viruses are not composed of cells.
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| Which of the following provides the most significant support for the idea that viruses are nonliving chemicals? | They cannot reproduce themselves outside of a host.
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| Which of the following is not true about spikes? | They are used for penetration.
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| Which of the following is not used as a criterion to classify viruses? | Biochemical tests
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| Which of the following is not a method of culturing viruses? | In culture media
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| A clear area against a confluent "lawn" of bacteria is called a | Plaque
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| An infectious protein is a | Prion
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| An envelope is acquired during which of the following steps? | Release
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| Host Range | refers to the spectrum of host cells in which a virus can multiply
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| Host Range is determined by: | the specific attachment site on the host cell's surface and the availbility of host cellular factors
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| Viral size is ascertained by: | Electron microscopy
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| What is "viruses range" in length? | 20 to 1000 nm
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| A complete, fully developed viral particle composed of nucleic acid surrounded by a coat | Virion
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| T/F Viruses contain either DNA or RNA, never both | True.
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| In relation to protein in viruses ranges from about 1% to about 50%. | The porportion of nucleic acid.
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| The protein coat surrounding the nucleic acid of a virus is called: | capsid
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| Some envelopes are covered with carbohydrate-protein complexes called | Spikes
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| resemble long rods, and their capsids are hollow cylinders surrounding the nucleic acid | Helical viruses - for example Ebola virus
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| What virus is manysided? Usually the capsid is an icosahedron | Polyhedral virus - for example adenovirus
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| Enveloped helical virus | influenza virus
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| Enveloped polyhedral virus | Simplexvirus
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| Classificatioin of viruses are based on: | type of nucleic acid, strategy for replication, and morphology
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| Virus family names end in | -viridae
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| Virus genus names end in | -virus
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| A group of viruses sharing the same genetic information and ecological niche | viral species
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| _____ must be grown in living cells. | Viruses
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| What is the easiest virus to grow? | bacteriophages
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| The plaque method mixes: | bacteriophages with host bacteria and nutrient agar.
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| Each plaque originates with a single viral particle. teh concentration of viruses is given as: | plaque-forming units
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| What two viruses provide models to study human AIDS? | Simian AIDS and feline AIDS
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| Cells growing in culture media in the lab are: | Cell cultures.
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| What test are used most often to identify viruses?. | Serological tests
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| Viruses may be indentified by: | RFLPs and PCR
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