Chapter 13 Quiz MCB
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| How do all viruses differ from bacteria? Viruses are not composed of cells. Viruses are filterable. Viruses are obligate intracellular parasites. Viruses do not have any nucleic acid. Viruses do not reproduce. | show 🗑
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| A feature that may be found in viruses but never in bacteria is an ability to infect more than one type of host. they cannot reproduce themselves outside a host. the ability to pass through 0.22 micrometer pore filters. may contain an RNA | show 🗑
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| show | They are found only on nonenveloped viruses.
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| Which of the following is NOT used as a criterion to classify viruses? biochemical tests size morphology nucleic acid number of capsomeres | show 🗑
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| show | culture media
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| show | biosynthesis
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| show | phage DNA is incorporated into host cell DNA.
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| A viroid is a(n) infectious protein. provirus. capsid without nucleic acid. complete, infectious virus particle. infectious piece of RNA without a capsid. | show 🗑
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| Figure 13.1 In Figure 13.1, which structure is a complex virus? a b c d All of the structures are complex viruses. | show 🗑
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| show | nucleic acid.
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| show | plaque.
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| Continuous cell lines differ from primary cell lines in that continuous cell lines always have to be re-isolated from animal tissues. viruses can be grown in continuous cell lines. continuous cell lines can be maintained through an indefini | show 🗑
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| show | PrPSc
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| show | the disease process occurs gradually over a long period.
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| show | Varicellavirus infection.
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| show | immunity to reinfection by any phage.
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| show | synthesis of double-stranded RNA from an RNA template
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| An infectious protein is a retrovirus. viroid. papovavirus. prion. bacteriophage. | show 🗑
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| show | release
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| Which of the following statements is NOT true of lysogeny? Lytic cycle may follow lysogeny. Prophage is inserted into the host genome. It causes lysis of host cells. It can give infected pathogens the genetic information for toxin product | show 🗑
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| An example of a latent viral infection is subacute sclerosing panencephalitis. cold sores. smallpox. influenza. mumps. | show 🗑
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| show | presence of receptor sites on the cell membrane.
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| show | togavirus
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| The mechanism whereby an enveloped virus leaves a host cell is called abduction. penetration. lysogeny. transduction. budding. | show 🗑
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| show | cancer that developed in chickens following injection of cell-free filtrates.
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| Bacteriophages derive all of the following from the host cell EXCEPT ATP. amino acids. nucleotides. lysozyme. tRNA. | show 🗑
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| show | injection of naked nucleic acid into the host cell.
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| Generally, in an infection caused by a DNA-containing virus, the host animal cell supplies all of the following EXCEPT tRNA. RNA polymerase. nucleotides. DNA polymerase. | show 🗑
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| Which of the following places these items in the correct order for DNA-virus replication? 1. Maturation 2. DNA synthesis 3. Transcription 4. Translation 1; 2; 3; 4 3; 4; 1; 2 4; 1; 2; 3 2; 3; 4; 1 4; 3; 2; 1 | show 🗑
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| A viral species is a group of viruses that has the same genetic information and ecological niche. infects the same cells and cause the same disease. has the same morphology and nucleic acid. cannot be defined. | show 🗑
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| Viruses that utilize reverse transcriptase belong to the virus families Retroviridae and Picornaviridae. Hepadnaviridae and Retroviridae. Rhabdoviridae and Herpesviridae. Herpesviridae and Retroviridae. Herpesviridae and Poxviridae. | show 🗑
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| DNA made from an RNA template will be incorporated into the virus capsid of influenzavirus. Retroviridae. Hepadnaviridae. Herpesviridae. bacteriophage families. | show 🗑
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| show | Viruses use their own catabolic enzymes.
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| A lytic virus has infected a patient. Which of the following would best describe what is happening inside the patient? The virus is causing the death of the infected cells in the patient. The virus is not killing any cells in the host. | show 🗑
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| Some viruses, such as human herpesvirus 1, infect a cell without causing symptoms. These are called lytic viruses. slow viruses. latent viruses. unconventional viruses. phages. | show 🗑
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| Assume a patient had chickenpox (human herpesvirus 3) as a child. Which line on the graph in Figure 13.2 would show the number of viruses present in this person as a 60-year-old with shingles (human herpesvirus 3)? a b c d e | show 🗑
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| show | c
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| show | uncoating
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| The following steps occur during multiplication of retroviruses. Which is the fourth step? uncoating synthesis of double-stranded DNA attachment penetration synthesis of +RNA | show 🗑
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| show | cause tumors to develop.
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| show | synthesis of DNA
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| Which of the following is most likely a product of an early gene? envelope proteins spike proteins DNA polymerase lysozyme capsid proteins | show 🗑
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| Most RNA viruses carry which of the following enzymes? DNA-dependent DNA polymerase ATP synthase lysozyme reverse transcriptase RNA-dependent RNA polymerase | show 🗑
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| What is NOT true regarding viruses that infect plants? They can sometimes be cultured in insect cells. They can spread via pollination. They are often cultured in embryonated chicken eggs. | show 🗑
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| show | a segmented genome
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| ________ were first identified in cancer-causing viruses and can induce ________ in infected cells. Segmented genomes; reassortment Oncogenes; transformation Herpes viruses; lesions T antigens; lysis | show 🗑
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| What is an oncogene? an altered form of a gene that may induce cancer a viral ligand found in a family of viruses a viral polymerase a problematic gene found exclusively in viruses a toxin gene transferred by a virus | show 🗑
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| What is the key characteristic of a transformed cell? is producing toxins affecting neighboring cells is infected with a lytic virus has acquired tumor-forming properties is producing budding viruses | show 🗑
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| Shingles is an example of reactivation of latent virus. lytic virus. transformation. persistent virus. lysogeny. | show 🗑
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| show | They are not composed of cells.
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| What type of immunity results from vaccination? innate immunity naturally acquired active immunity naturally acquired passive immunity artificially acquired active immunity artificially acquired passive immunity | show 🗑
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| show | artificially acquired passive immunity
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| show | naturally acquired active immunity
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| show | specific regions on antigens that interact with antibodies
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| show | naturally acquired passive immunity.
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| Which of the following statements is NOT a possible outcome of antigen-antibody reaction? agglutination ADCC activation of complement clonal deletion opsonization | show 🗑
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| show | natural killer cells
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| show | neutralization.
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| CD4+ T cells are activated by cytokines released by B cells. interaction between TCRs and MHC II. interaction between CD4+ and MHC II. complement. cytokines released by dendritic cells. | show 🗑
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| show | TH cell
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| The specificity of an antibody is due to the L chains. the H chains. the variable portions of the H and L chains. its valence. the constant portions of the H and L chains. | show 🗑
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| show | They recognize antigens associated with MHC I.
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| Which of the following is NOT a characteristic of cellular immunity? The cells originate in bone marrow. B cells make antibodies. Cells mature in the thymus gland. Response to abnormal cells. | show 🗑
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| Plasma cells are activated by a(n) B cell. T cell. antigen. APC. memory cell. | show 🗑
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| The antibodies found in mucus, saliva, and tears are IgD. IgM. IgG. IgA. IgE. | show 🗑
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| The antibodies found almost entirely and only on the surface of B cells (not secreted from them), and which always exist as monomers, are IgA. IgE. IgG. IgD. IgM. | show 🗑
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| show | IgE.
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| In addition to IgG, the antibodies that can fix complement are IgM. IgD. IgA. IgE. | show 🗑
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| Large antibodies that agglutinate antigens are IgG. IgE. IgM. IgA. IgD. | show 🗑
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| show | IgG.
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| show | c
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| show | e
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| In Figure 17.1, the arrow at time (d) indicates exposure to a new antigen. the secondary response. the time of exposure to the same antigen as at time (a). the T-cell response. the primary response. | show 🗑
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| Which of the following statements is FALSE? The variable region of a heavy chain is partially responsible for binding with antigen. The constant region of a heavy chain is the same for all antibodies. All of the answers are correct. | show 🗑
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| show | a chemical that elicits an antibody response and can combine with these antibodies
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| show | M cells
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| show | TH cell recognizes antigen-digest and MHC II.
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| show | c and d
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| show | a and b
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| In Figure 17.2, which areas represent antigen-binding sites? a and c b and d b and c a and b c and d | show 🗑
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| show | e
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| Which of the following bacterial components would most likely result in B cell stimulation by T-independent antigens? capsule plasmid flagellum ribosome pili | show 🗑
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| show | IgM
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| Which of the following destroys virus-infected cells? B cells dendritic cells CTL TH Treg | show 🗑
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| The following events occur in cellular immunity, leading to a response from TH cells. What is the third step? Antibodies are produced. Antigen enters M cell. TH cells proliferate. TH cell produces cytokines. | show 🗑
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| Cytokines released by TH1 cells convert TH1 cells to TH2 cells. convert TH2 cells to TH1 cells. directly kill parasites. convert B cells to T cells. activate CD8+ cells to CTLs. | show 🗑
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| show | perforin
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| At a minimum, the human immune system is capable of recognizing approximately how many different antigens? 105 1025 1020 1015 1010 | show 🗑
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| Thymic selection activates B cells. destroys B cells that make antibodies against self. destroys T cells that do not recognize self-molecules of MHC. destroys CD4+ cells that attack self. destroys MHC molecules. | show 🗑
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| Which of the following statements about natural killer cells is FALSE? They destroy tumor cells. They destroy cells lacking MHC I. They destroy virus-infected cells. They are stimulated by an antigen. | show 🗑
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| show | macrophages.
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| A Treg cell deficiency could result in transplant rejection. increased number of viral infections. increased number of bacterial infections. increased severity of bacterial infections. autoimmunity. | show 🗑
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| show | eukaryotic pathogens.
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| IL-2, produced by TH cells, activates TC cells to CTLs. causes phagocytosis. stimulates TH cell maturation. activates macrophages. activates antigen-presenting cells. | show 🗑
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| NK cells do all of the following EXCEPT kill cells not expressing MHCI. bind to Fc regions of bound antibodies. become activated by TH-2 cells. participate in antibody dependent cell cytotoxicity. | show 🗑
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| show | TH cells - MHCI interaction.
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| Which of the following statements about cytokines is FALSE? Some have multiple functions. They are soluble proteins or glycoproteins. They are produced by immune cells in response to a stimulus. There are 10 types. | show 🗑
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| A cell undergoing apoptosis will likely damage nearby cells. bursts and releases intracellular contents. was necessarily bound by antibodies. is employed as an infection-fighting mechanism. is a malfunction of the immune system. | show 🗑
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| The importance of M cells concerns presentation of epitopes in MHCII molecules. ability to migrate along the intestinal tract. facilitation of contact between antigens in the intestinal tract and the immune system. | show 🗑
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| Which of the following terms regarding roles of chemical messengers is mismatched? hematopoetic cytokine - development of blood cells interferons - interruption of viral infection tumor necrosis factor - stimulate tumor metastasis | show 🗑
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