Acellular Infectious Agents: Viruses, Viroids & Prions quiz #3 Flashcards
Acellular Infectious Agents: Viruses, Viroids & Prions quiz #3
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Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called These are called latent viruses. Which group of organisms are viroids (not viruses) most likely to parasitize? Viroids most commonly parasitize plants. A(n) ______ is an infectious protein and is simpler than a virus. A prion is an infectious protein and is simpler than a virus. Select the two characteristics that all viruses share. All viruses have genetic material and a protein coat. What is the main function of the viral capsid and envelope? The capsid and envelope protect the viral genome and aid in host cell attachment. Place the statements about viroids and prions into the correct columns. Not all statements are used. Viroids: Infect plants, made of circular RNA. Prions: Infectious proteins, cause degenerative diseases. Which of the following statements best supports the argument that viruses are nonliving? Viruses are nonliving because they are not made of cells and cannot reproduce independently. What are the components common to all virions? All virions have genetic material and a protein capsid. Measles viruses are capable of inactivating host defenses by Measles viruses can suppress the host immune response. Emerging viruses that infect human cells can originate from __________. Emerging viruses can originate from animal reservoirs. Select the true statement about viral infection of a host cell. Viruses must enter a host cell to replicate. Bacteriophages and animal viruses do not differ significantly in which one of the following steps? Both bacteriophages and animal viruses attach to host cells. Helical and icosahedral are terms used to describe the shapes of a virus Helical and icosahedral describe the shapes of viral capsids. What are the three parts that make up the structure of most viruses? Most viruses have genetic material, a protein capsid, and sometimes an envelope. Budding is the release of ______ viruses. Budding is the release of enveloped viruses. Which characteristic of viruses prevents them from being used as evidence to support cell theory? Viruses are acellular, so they do not support cell theory. Which of the following are characteristics of a virus? Viruses are acellular, have genetic material, and require a host to replicate. Mad cow disease is caused by a noncellular infectious agent called a Mad cow disease is caused by a prion. A common characteristic of viral pneumonia is Viral pneumonia often presents with nonproductive cough and diffuse lung involvement. Viroids are tiny molecules of circular _____ that are important infectious agents of _____. Viroids are tiny molecules of circular RNA that infect plants. The limitation of the type of cell that a virus can invade is called the The limitation is called the host range. Virus nucleic acid is injected into host cell The viral genome is injected into the host cell during infection. Which of the following processes can viruses carry out Viruses can replicate only inside a host cell. Viruses can be grown in all of the following except __________. Viruses cannot be grown in nonliving media. Viruses are nonliving particles with a(n) made of nucleic acids. Viruses are nonliving particles with a genome made of nucleic acids. All viruses are made up of two components. These components are All viruses have genetic material and a protein capsid. Bacteriophages derive all of the following from the host cell except Bacteriophages do not derive their protein capsid from the host cell. A retrovirus has a genome that consists of __________. A retrovirus has a genome consisting of RNA. What structure is found in viruses but not in cells? The protein capsid is found in viruses but not in cells. An example of a latent virus infection is __________. Herpes simplex virus infection is an example of a latent virus infection. Which of the following cannot be used to culture viruses Viruses cannot be cultured in nonliving media. The nucleocapsid is composed of ______. The nucleocapsid is composed of the viral genome and the protein capsid. A prion is best described as ______. A prion is a misfolded infectious protein. Endotoxins are also known as Endotoxins are also known as lipopolysaccharides from bacterial cell walls. Select the description that would represent a pathogen that would be considered a virus. A virus is an acellular particle with genetic material in a protein coat that infects living cells. Host cells of viruses include Viruses can infect all forms of life: bacteria, archaea, and eukaryotes. The nucleocapsid is composed of The nucleocapsid is composed of the viral genome and the protein capsid. A(n) ________ is the portion of virus code that is unique to a particular computer virus. This refers to computer viruses; in biology, viruses have unique genetic sequences. All of the following are characteristics of viruses except Viruses do not carry out metabolism. Because the virus that causes influenza mutates, a new vaccine is created every year. True. Influenza virus mutates frequently, requiring new vaccines annually.
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