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Microbiology

BIO 205- Chapter 13 Viruses, Viroids and Prions

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