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Immunity MCQs for MDCAT Practice

Biology section, Immunity chapter. Up to eight free sample questions, each with the correct answer and a worked explanation. The full chapter opens in the app.

The bank has 695 active questions on this chapter. Your first 500 practice attempts are free, and every attempt includes a worked explanation.

  1. Question 1
    Which of the following diseases can be prevented through vaccination?
    • AIDS and Cancer
    • Malaria and AIDS
    • Typhoid and Cancer
    • Measles and Mumps (correct answer)
    Correct answer: D
    Vaccination is a cornerstone of infectious disease prevention, effectively targeting viral illnesses like measles and mumps, but not all diseases.
  2. Question 2
    Pathogens inside the body are killed by:
    • Antibodies
    • Immune system Cells
    • Interferon
    • All of these (correct answer)
    Correct answer: D
    The body employs a multi-pronged defense against pathogens, involving antibodies, immune cells, and interferons, all crucial for eradication.
  3. Question 3
    In case of snake bite venom, passive immunity is produced by antitoxins, so the serum is called:
    • Antivenom serum (correct answer)
    • Antiserum
    • Passive immunity serum
    • Anti snake serum
    Correct answer: A
    Snake bite venom treatment utilizes passive immunity; the serum administered is specifically called antivenom serum, distinguishing it from general antisera.
  4. Question 4
    B.C.G vaccines are usually given to:
    • Children (correct answer)
    • Adults
    • Special populations
    • All of the above
    Correct answer: A
    The B.C.G vaccine is primarily administered to infants and young children to protect them against tuberculosis (TB).
  5. Question 5
    ___________ are Y-shaped proteins that circulate through blood stream and bind to specific antigens thereby attacking microbes:
    • Haemoglobin
    • Antibodies (correct answer)
    • Interferons
    • Myoglobin
    Correct answer: B
    Y-shaped proteins in blood that target antigens are antibodies, key players in humoral immunity.
  6. Question 6
    If you suspect a major deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
    • Haemocytes
    • Serum globulins (correct answer)
    • Fibrinogen in plasma
    • Serum albumins
    Correct answer: B
    Antibodies, crucial for immunity, are a type of serum globulin. A deficiency in antibodies directly points to a problem with this specific protein fraction in the blood.
  7. Question 7
    Discriminate between normal health and diseases.
    • Normal health is the ability to perform daily activities, while disease is the inability to do so. (correct answer)
    • Normal health is the absence of disease, while disease is the presence of pathogens in the body.
    • Normal health is a state of complete physical well-being, while disease is a state of mental illness only.
    • Normal health is the absence of all symptoms, while disease is the presence of any symptom.
    Correct answer: A
    Understanding the distinction between normal physiological states and pathological conditions is fundamental to diagnosing and treating diseases.
  8. Question 8
    In higher vertebrates, the immune system can distinguish self-cells and non-self. If this property is lost due to genetic abnormality and it attacks self cells, then it leads to:
    • Autoimmune disease (correct answer)
    • Active immunity
    • Allergic response
    • Graft rejection
    Correct answer: A
    When the immune system loses self-tolerance and attacks the body's own cells, it results in autoimmune diseases, not other immune responses.

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Read the full Immunity chapter notes: Immunity notes. Or browse every chapter.