Questions and Answers
Which genetic mechanism increases the number of different antibody molecules during an immune response without increasing the diversity of the pool of antigen receptor specificities?
Which class of antibody increases the stickiness of mucus?
What initiates the classical pathway of complement activation most efficiently?
Which immunologic test is widely used to collect and count cells expressing an antigen bound by a fluorescence-tagged monoclonal antibody?
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A 2-year-old child with recurrent bacterial infections like pneumonia is most likely deficient in?
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Immune hemolytic anemia associated with penicillin-induced antibodies that attack red blood cells is most likely to have suffered this type of hypersensitivity reaction?
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With regard to the identification of microbes by sequencing 16s rRNA genes for database matches, which is not a true statement?
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If PCR-based profiling methods are used to compare DNA banding patterns of microbial communities for similarities and differences, which of the following is a true statement?
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Which of the following components is essential for the Sanger method?
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Penicillin-related antibodies in the serum are indicative of which type of hypersensitivity?
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What type of cells are primarily involved in the mechanical defense of the human body?
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Which antibody can cross the placenta to provide passive immunity to the fetus?
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Which scientist is recognized for introducing the concept of vaccination?
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In which advanced method is the term 'Shotgun' commonly used?
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Which components are found in peptidoglycan but not cellulose?
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Which antibody class is characterized by its 'light' chains being identical?
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Which type of infection is more likely to occur in a hospital setting?
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Who is the first scientist known for the concept of aseptic surgery?
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What type of cells are most likely involved in the immune response within the epidermis?
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Which of the following best describes the role of C3b in the immune system?
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What characteristic differentiates the adaptive immune response from the innate immune response?
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Which method utilizes tagged beads for identifying nucleotide sequences?
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Which of the following is NOT essential for the PCR reaction to occur?
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What is a hallmark of monoclonal antibodies generated from a single complex antigen?
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Which complement component is primarily involved in enhancing phagocytosis?
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Which of these methods is associated with next-generation sequencing that uses fluorescent identifiers?
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How is diversity in the immune response primarily generated?
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Which of the following describes the function of special first defenses in the immune system?
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Study Notes
Antibody Mechanisms and Classes
- Somatic hypermutation increases the number of different antibody molecules during an immune response without enhancing receptor specificity.
- IgA class antibodies increase the stickiness of mucus, playing a vital role in mucosal immunity.
- IgG initiates the classical pathway of complement activation most efficiently.
Immunologic Tests
- Fluorescence-activated cell sorting (FACS) is widely used to collect and count cells expressing an antigen tagged by monoclonal antibodies.
Immunodeficiencies
- A child with recurrent bacterial infections is likely deficient in B cells, indicating problems with humoral immunity.
Hypersensitivity Reactions
- Immune hemolytic anemia due to penicillin-induced antibodies is classified as a Type II hypersensitivity reaction.
- Penicillin-related antibodies indicate a Type II hypersensitivity response.
Microbial Identification Methods
- Sequencing 16S rRNA genes provides limited physiological insights, may miss some species, and does not quantify microbial populations accurately.
- PCR-based profiling is cost-effective, allows simultaneous analysis of multiple samples, but does not identify community members taxonomically.
Sequencing Techniques
- The Sanger method utilizes ddNTPs (dideoxynucleotide triphosphates).
- Advanced methods of DNA sequencing include Pyrosequencing and Shotgun sequencing.
Components of Bacterial Structure
- Peptidoglycan structure includes N-acetylmuramic acid (NAM) and N-acetylglucosamine (NAG), essential for bacterial cell wall integrity.
- Teichoic acid is present in Gram-positive but not in Gram-negative bacteria.
Immunology Fundamentals
- NK cells express MHC class I molecules but not MHC class II.
- Nosocomial infections are commonly found in hospitals due to the prevalence of antibiotic-resistant organisms.
- Mechanical defenses against pathogens include membranes, the epidermis, and the dermis.
Vaccination and Germ Theory
- The concept of vaccination was pioneered by Edward Jenner, who first vaccinated against smallpox.
- Louis Pasteur is credited with proposing the Germ Theory of Disease.
Immune Response Features
- Class I and II MHCs present antigens to T lymphocyte subsets.
- Characteristics unique to adaptive immunity include clonal expansion of B lymphocytes, a process absent in innate immunity.
Antibody Structure
- Antibody light chains may be chemically heterogeneous, resulting from the immune response to a single complex antigen.
- Antibodies can cross the placenta, with IgG being the primary class involved.
Next Generation Sequencing
- Illumina sequencing employs plate bridges for nucleotide sequence identification and is used in various genetic tests.
Unique Immune Cell Types
- Immune cells in the epidermis include keratinocytes and Langerhans cells, which contribute to skin immunity.
PCR Requirements
- PCR does not require amino acids; it primarily needs DNA polymerase, primers, and nucleotides for the amplification process.
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Description
Test your knowledge on key concepts in immunology, including antibody diversity and the complement system. This quiz covers important topics such as class switching, somatic hypermutation, and the functions of various antibody classes. Challenge yourself and see how well you understand the immune response!
