High‑school/pre‑med level questions on innate vs adaptive immunity, cells of the immune system, antibodies, vaccination, inflammation, allergy and autoimmunity.
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src="https://entermedschool.org/embed/questions#{"title":"Basic Immunology: Concepts for Pre-med/IB","questions":[{"prompt":"Immunity is best defined as:","options":[{"label":"A","body":"The complete absence of microorganisms in the body","isCorrect":false},{"label":"B","body":"The body's ability to resist and fight infection by harmful agents","isCorrect":true},{"label":"C","body":"The ability to digest food efficiently","isCorrect":false},{"label":"D","body":"The production of red blood cells","isCorrect":false},{"label":"E","body":"The process of breathing oxygen","isCorrect":false}],"explanation":"Immunity refers to the body's defence capacity against pathogens and other harmful substances."},{"prompt":"Which of the following is part of the BODY'S FIRST LINE of defence against infection?","options":[{"label":"A","body":"Antibodies in the blood","isCorrect":false},{"label":"B","body":"Cytotoxic T cells","isCorrect":false},{"label":"C","body":"Intact skin and mucous membranes","isCorrect":true},{"label":"D","body":"Memory B cells","isCorrect":false},{"label":"E","body":"Vaccination","isCorrect":false}],"explanation":"Physical and chemical barriers such as skin, mucus, tears and stomach acid form the first line of defence."},{"prompt":"Innate (nonspecific) immunity differs from adaptive (specific) immunity because innate immunity:","options":[{"label":"A","body":"Is present from birth and responds rapidly to many pathogens in the same way","isCorrect":true},{"label":"B","body":"Develops only after vaccination","isCorrect":false},{"label":"C","body":"Has memory and improves with repeated exposure","isCorrect":false},{"label":"D","body":"Acts only against one specific type of virus","isCorrect":false},{"label":"E","body":"Depends entirely on antibody production","isCorrect":false}],"explanation":"Innate immunity is present at birth, reacts quickly and in a general way; adaptive immunity is specific and has memory."},{"prompt":"Which of the following is primarily a component of ADAPTIVE immunity?","options":[{"label":"A","body":"Skin barrier","isCorrect":false},{"label":"B","body":"Stomach acid","isCorrect":false},{"label":"C","body":"B lymphocytes producing antibodies","isCorrect":true},{"label":"D","body":"Phagocytic neutrophils","isCorrect":false},{"label":"E","body":"Natural killer (NK) cells","isCorrect":false}],"explanation":"B cells and the antibodies they produce are key parts of specific (adaptive) immunity."},{"prompt":"Which of the following cell types is BEST known for engulfing and digesting microbes (phagocytosis) as part of innate immunity?","options":[{"label":"A","body":"B lymphocytes","isCorrect":false},{"label":"B","body":"Cytotoxic T lymphocytes","isCorrect":false},{"label":"C","body":"Neutrophils and macrophages","isCorrect":true},{"label":"D","body":"Erythrocytes","isCorrect":false},{"label":"E","body":"Platelets","isCorrect":false}],"explanation":"Neutrophils and macrophages are professional phagocytes that ingest and destroy pathogens."},{"prompt":"Which statement about antibodies (immunoglobulins) is TRUE?","options":[{"label":"A","body":"They are produced by T lymphocytes","isCorrect":false},{"label":"B","body":"They are produced by plasma cells derived from B lymphocytes","isCorrect":true},{"label":"C","body":"They are produced only before birth","isCorrect":false},{"label":"D","body":"They are enzymes that digest bacteria","isCorrect":false},{"label":"E","body":"They are lipids stored in adipose tissue","isCorrect":false}],"explanation":"Activated B cells differentiate into plasma cells, which secrete antibodies specific for an antigen."},{"prompt":"An antigen is best defined as:","options":[{"label":"A","body":"Any molecule that can be recognised and specifically bound by an antibody or T cell receptor","isCorrect":true},{"label":"B","body":"Any protein made by lymphocytes","isCorrect":false},{"label":"C","body":"A special type of white blood cell","isCorrect":false},{"label":"D","body":"A chemical that always causes disease","isCorrect":false},{"label":"E","body":"A molecule that cannot be recognised by the immune system","isCorrect":false}],"explanation":"Antigens are typically foreign molecules that can trigger a specific immune response and bind to antibodies or T-cell receptors."},{"prompt":"Which of the following pairs is correctly matched?","options":[{"label":"A","body":"B cells – cell-mediated immunity","isCorrect":false},{"label":"B","body":"Cytotoxic T cells – kill virus-infected cells","isCorrect":true},{"label":"C","body":"Helper T cells – produce antibodies directly","isCorrect":false},{"label":"D","body":"Macrophages – produce antibodies","isCorrect":false},{"label":"E","body":"Red blood cells – antigen presentation","isCorrect":false}],"explanation":"Cytotoxic T cells (CD8⁺ T cells) kill virus-infected or abnormal cells. B cells handle antibody (humoral) immunity."},{"prompt":"The MAIN function of helper T cells (Th cells) is to:","options":[{"label":"A","body":"Engulf and digest bacteria directly","isCorrect":false},{"label":"B","body":"Produce antibodies against viruses","isCorrect":false},{"label":"C","body":"Coordinate the immune response by activating B cells and other immune cells","isCorrect":true},{"label":"D","body":"Carry oxygen to tissues","isCorrect":false},{"label":"E","body":"Form blood clots","isCorrect":false}],"explanation":"Helper T cells release signals (cytokines) that activate B cells, cytotoxic T cells and macrophages, orchestrating the immune response."},{"prompt":"Which type of immunity primarily involves antibodies circulating in blood and body fluids?","options":[{"label":"A","body":"Cell-mediated immunity","isCorrect":false},{"label":"B","body":"Humoral immunity","isCorrect":true},{"label":"C","body":"Mechanical immunity","isCorrect":false},{"label":"D","body":"Hormonal immunity","isCorrect":false},{"label":"E","body":"Innate barrier immunity","isCorrect":false}],"explanation":"Humoral (antibody-mediated) immunity involves antibodies in body fluids, mainly produced by B cells."},{"prompt":"Cell-mediated immunity is MOST important for defending against:","options":[{"label":"A","body":"Extracellular bacteria in the blood","isCorrect":false},{"label":"B","body":"Viruses and pathogens inside host cells","isCorrect":true},{"label":"C","body":"Physical injuries","isCorrect":false},{"label":"D","body":"Dehydration","isCorrect":false},{"label":"E","body":"High blood pressure","isCorrect":false}],"explanation":"Cell-mediated immunity (mainly cytotoxic T cells) targets infected or abnormal cells, such as virus-infected or cancer cells."},{"prompt":"Which description BEST matches the inflammatory response?","options":[{"label":"A","body":"A specific antibody response to a single antigen","isCorrect":false},{"label":"B","body":"A rapid, nonspecific reaction causing redness, heat, swelling and pain at a site of injury or infection","isCorrect":true},{"label":"C","body":"A process where only T cells are activated","isCorrect":false},{"label":"D","body":"A long-term memory response after vaccination","isCorrect":false},{"label":"E","body":"A purely psychological reaction to stress","isCorrect":false}],"explanation":"Inflammation is part of innate immunity, drawing immune cells to the site and helping contain and repair damage."},{"prompt":"Which of the following is the BEST description of immunological memory?","options":[{"label":"A","body":"The ability of immune cells to store glucose","isCorrect":false},{"label":"B","body":"The ability of the immune system to respond faster and stronger to a second encounter with the same antigen","isCorrect":true},{"label":"C","body":"The storage of antibodies in the brain","isCorrect":false},{"label":"D","body":"The process of inflammation at the site of injury","isCorrect":false},{"label":"E","body":"The ability of red blood cells to remember oxygen levels","isCorrect":false}],"explanation":"Memory B and T cells are formed during the primary response and allow a quicker, more powerful secondary response."},{"prompt":"Which comparison between the PRIMARY and SECONDARY immune response is correct?","options":[{"label":"A","body":"Primary response is faster and stronger than secondary","isCorrect":false},{"label":"B","body":"Secondary response is faster and produces higher antibody levels than primary","isCorrect":true},{"label":"C","body":"Primary response involves memory cells, secondary does not","isCorrect":false},{"label":"D","body":"Secondary response occurs only in innate immunity","isCorrect":false},{"label":"E","body":"Primary and secondary responses are identical","isCorrect":false}],"explanation":"The secondary response benefits from memory cells, making it quicker and more intense."},{"prompt":"Vaccination (immunisation) protects mainly by:","options":[{"label":"A","body":"Killing all bacteria in the body directly","isCorrect":false},{"label":"B","body":"Teaching red blood cells to carry more oxygen","isCorrect":false},{"label":"C","body":"Stimulating the immune system to form memory cells against a harmless form of a pathogen or its antigens","isCorrect":true},{"label":"D","body":"Creating physical barriers on the skin","isCorrect":false},{"label":"E","body":"Replacing the innate immune system","isCorrect":false}],"explanation":"Vaccines expose the immune system to antigens in a safe way, generating memory cells that respond rapidly on real infection."},{"prompt":"Which of the following is an example of ACTIVE immunity?","options":[{"label":"A","body":"A baby receiving antibodies through breast milk","isCorrect":false},{"label":"B","body":"Injection of antibodies from another person or animal","isCorrect":false},{"label":"C","body":"Developing immunity after recovering from an infection","isCorrect":true},{"label":"D","body":"Antibodies crossing the placenta from mother to fetus","isCorrect":false},{"label":"E","body":"Barrier protection from skin","isCorrect":false}],"explanation":"Active immunity results from the person's own immune response (after infection or vaccination); antibodies made elsewhere are passive immunity."},{"prompt":"Which of the following is an example of PASSIVE immunity?","options":[{"label":"A","body":"Vaccination with weakened viruses","isCorrect":false},{"label":"B","body":"Production of antibodies after chickenpox","isCorrect":false},{"label":"C","body":"Transfer of maternal antibodies across the placenta to the fetus","isCorrect":true},{"label":"D","body":"Activation of memory T cells","isCorrect":false},{"label":"E","body":"Formation of memory B cells after infection","isCorrect":false}],"explanation":"Passive immunity is the transfer of ready‑made antibodies (e.g. from mother to baby or antibody injections)."},{"prompt":"Which statement about self vs non‑self recognition is MOST accurate?","options":[{"label":"A","body":"The immune system normally ignores the body's own cells and targets foreign molecules","isCorrect":true},{"label":"B","body":"The immune system always attacks self tissues","isCorrect":false},{"label":"C","body":"The immune system cannot distinguish between self and non‑self","isCorrect":false},{"label":"D","body":"Self tolerance means the immune system never attacks any cell","isCorrect":false},{"label":"E","body":"Only innate immunity can distinguish self from non‑self","isCorrect":false}],"explanation":"Healthy immune systems are tolerant of self but reactive to non‑self; failure of this leads to autoimmunity."},{"prompt":"Autoimmune diseases occur when:","options":[{"label":"A","body":"The immune system is completely absent","isCorrect":false},{"label":"B","body":"The immune system attacks the body's own cells as if they were foreign","isCorrect":true},{"label":"C","body":"A person does not receive any vaccines","isCorrect":false},{"label":"D","body":"Only innate immunity is active","isCorrect":false},{"label":"E","body":"The body fails to produce any antibodies","isCorrect":false}],"explanation":"In autoimmunity, self‑tolerance is lost and immune responses are directed against the body's own tissues."},{"prompt":"Allergic reactions (such as hay fever or some food allergies) are best described as:","options":[{"label":"A","body":"Normal immune responses to dangerous pathogens","isCorrect":false},{"label":"B","body":"Overreactions of the immune system to harmless substances like pollen or foods","isCorrect":true},{"label":"C","body":"Complete failure of the immune system","isCorrect":false},{"label":"D","body":"Autoimmune attacks on joints","isCorrect":false},{"label":"E","body":"Purely psychological conditions with no immune involvement","isCorrect":false}],"explanation":"Allergy is a hypersensitive immune response to non‑harmful antigens (allergens)."}]}"
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