front 1 Which of the following statements is FALSE? The prophage makes the host cell immune to infection by other phages. A prophage is phage DNA inserted into a bacterial chromosome. Prophage genes are repressed by a repressor protein coded for by the prophage. A prophage may result in new properties of the host cell. A prophage can "pop" out of the chromosome. | back 1 The prophage makes the host cell immune to infection by other phages. |
front 2 An infectious protein is a papovavirus. retrovirus. prion. viroid. bacteriophage. | back 2 prion |
front 3 A viroid is a completely developed infectious agent composed of nucleic acid and surrounded by a capsid. True/False | back 3 False |
front 4 Which of the following places these items in the correct order for
DNA-virus replication? | back 4 2,3,4,1 |
front 5 Which of the following statements provides the most significant support for the idea that viruses are nonliving chemicals? They are filterable. They cause diseases similar to those caused by chemicals. They are chemically simple. They are not composed of cells. They cannot reproduce themselves outside a host. | back 5 They cannot reproduce themselves outside a host. |
front 6 Which one of the following steps does NOT occur during multiplication of a picornavirus? synthesis of DNA synthesis of + strands of RNA synthesis of - strands of RNA synthesis of viral proteins None of the answers is correct. | back 6 synthesis of DNA |
front 7 Continuous cell lines differ from primary cell lines in that: viruses can be grown in continuous cell lines. continuous cell lines can be maintained through an indefinite number of generations. continuous cell lines are derived from primary cell lines. continuous cell lines always have to be re-isolated from animal tissues. continuous cell lines are from human embryos. | back 7 continuous cell lines can be maintained through an indefinite number of generations. |
front 8 Which of the following would be the first step in biosynthesis of a virus with a - (minus) strand of RNA synthesis of DNA from a DNA template synthesis of DNA from an RNA template transcription of mRNA from DNA synthesis of double-stranded RNA from an RNA template synthesis of double-stranded RNA from a DNA template | back 8 synthesis of double-stranded RNA from an RNA template |
front 9 An envelope is acquired during which of the following steps? uncoating biosynthesis penetration release adsorption | back 9 release |
front 10 Lysogeny can result in all of the following EXCEPT immunity to reinfection by any phage. specialized transduction. immunity to reinfection by the same phage. phage conversion. acquisition of new characteristics by the host cell. | back 10 immunity to reinfection by any phage. |
front 11 Bacteriophage replication differs from animal virus replication because only bacteriophage replication involves? adsorption to specific receptors. lysis of the host cell.replication of viral nucleic acid. injection of naked nucleic acid into the host cell.assembly of viral components. | back 11 injection of naked nucleic acid into the host cell |
front 12 Assume a patient has influenza. During which time (on the graph in
Figure 13.2) would the patient show the symptoms of the
illness? | back 12 C) c |
front 13 Viruses are the only known infectious agents that are obligatory intracellular parasites. True/False | back 13 False |
front 14 A virus's ability to infect an animal cell depends primarily upon the type of viral nucleic acid. presence of receptor sites on the cell membrane. presence of pili on the host cell wall. enzymatic activity of a host cell. host cell's ability to phagocytize viral particles. | back 14 presence of receptor sites on the cell membrane. |
front 15 ________ were first identified in cancer-causing viruses and can induce ________ in infected cells. A) Herpes viruses; lesions B) Oncogenes; transformation C) T antigens; lysis D) Glycoprotein spikes; syncytia formation E) Segmented genomes; reassortment | back 15 B) Oncogenes; transformation |
front 16 Helical and icosahedral are terms used to describe the shapes of a virus envelope. True/False | back 16 False |
front 17 Which of the following is NOT utilized to culture viruses? A) laboratory animals B) culture media C) embryonated eggs D) animal cell cultures E) bacterial cultures | back 17 B) culture media |
front 18 A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient? A) The virus is causing the death of the infected cells in the patient. B) The virus is not killing any cells in the host. C) The virus is incorporating its nucleic acid with that of the patient's cells. D) The virus is slowly killing the patient's cells. E) The virus is infecting cells and then releasing only small amounts of virus. | back 18 A) The virus is causing the death of the infected cells in the patient. |
front 19 A viroid is a(n) A) complete, infectious virus particle. B) infectious piece of RNA without a capsid. C) capsid without nucleic acid. D) provirus. E) infectious protein. | back 19 B) infectious piece of RNA without a capsid. |
front 20 Which of the following is necessary for replication of a prion? A) DNA B) DNA polymerase C) lysozyme D) PrPSc E) RNA | back 20 D) PrPSc |
front 21 Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called A) latent viruses. B) lytic viruses. C) phages. D) slow viruses. E) unconventional viruses. | back 21 A) latent viruses. |
front 22 An example of a latent viral infection is A) subacute sclerosing panencephalitis. B) cold sores. C) influenza. D) smallpox. E) mumps. | back 22 B) cold sores. |
front 23 The definition of lysogeny is A) phage DNA is incorporated into host cell DNA. B) lysis of the host cell due to a phage. C) the period during replication when virions are not present. D) when the burst time takes an unusually long time. E) attachment of a phage to a cell. | back 23 A) phage DNA is incorporated into host cell DNA. |
front 24 How do all viruses differ from bacteria? A) Viruses are filterable. B) Viruses are obligate intracellular parasites. C) Viruses do not have any nucleic acid. D) Viruses are not composed of cells. E) Viruses do not reproduce. | back 24 D) Viruses are not composed of cells. |
front 25 Which of the following is most likely a product of an early gene? A) capsid proteins B) DNA polymerase C) envelope proteins D) spike proteins E) lysozyme | back 25 B) DNA polymerase |
front 26 44) The following steps occur during biosynthesis of a + strand RNA virus. What is the third step? A) attachment B) penetration and uncoating C) synthesis of - strand RNA D) synthesis of + strand RNA E) synthesis of viral proteins | back 26 C) synthesis of - strand RNA |
front 27 4) Glycoprotein spikes are found on the capsids of all viruses. True/False | back 27 False |
front 28 Binomial nomenclature is used to name viruses. True/False | back 28 False |
front 29 31) Viruses that utilize reverse transcriptase belong to the virus
families | back 29 C) Hepadnaviridae and Retroviridae. |
front 30 23) Assume you have isolated an unknown virus. This virus has a single, positive sense strand of RNA, and possesses an envelope. To which group does it most likely belong? A) herpesvirus B) picornavirus C) retrovirus D) togavirus E) papovavirus | back 30 D) togavirus |
front 31 Most drugs that interfere with viral multiplication also interfere with host cell function. True/False | back 31 True |
front 32 Which of the following statements about viruses is FALSE? A) Viruses contain DNA or RNA but never both. B) Viruses contain a protein coat. C) Viruses use the anabolic machinery of the cell. D) Viruses use their own catabolic enzymes. E) Viruses have genes. | back 32 D) Viruses use their own catabolic enzymes. |
front 33 Dogs do not get measles because their cells lack the correct receptor sites for that virus. True/False | back 33 True |
front 34 38) The following steps occur during multiplication of herpesviruses. Which is the third step? A) attachment B) biosynthesis C) penetration D) release E) uncoating | back 34 E) uncoating |
front 35 The basic mechanism of viral multiplication is similar for all viruses. | back 35 True |