14 practice MCQs on innate and adaptive immunity, antibodies and antigens, vaccines and immune disorders. Every question has the correct answer and an explanation.
Start free — 20 questionsImmunity is part of the MDCAT Biology syllabus. This page collects Immunity MCQs in the style of past MDCAT papers — below are 12 of them with answers and explanations, and the full set of 14 questions is in the HighYield MDCAT QBank.
This chapter covers: innate and adaptive immunity, antibodies and antigens, vaccines and immune disorders.
Correct answer: D. Measles and Mumps
Measles and mumps are viral diseases preventable through vaccination (the MMR vaccine); AIDS currently has no vaccine and cancer is not an infectious disease.
Correct answer: B. Biological Control
Biological control regulates pest populations using their natural enemies, predators, parasites and pathogens rather than chemical means.
Correct answer: B. Passive
Snake bite is treated with passive immunization, administering pre-formed antivenom antibodies for immediate protection.
Correct answer: D. Immunoglobulins
In passive immunity, immunoglobulins (pre-formed antibodies) are injected directly into the body to confer immediate protection.
Correct answer: B. Variable part
The variable region of an antibody is the part that specifically recognizes and binds to its corresponding antigen.
Correct answer: A. Disulphide bridges
The two heavy chains and two light chains of an antibody molecule are held together by disulphide bridges.
Correct answer: D. Variable part
The variable region of an antibody, located at the tips of the heavy and light chains, is responsible for recognizing the antigen.
Correct answer: B. Passive immunity
Passive immunity is achieved by injecting pre-formed antibodies, antiserum, or anti-venom serum, providing rapid but short-lived protection.
Correct answer: D. Tetanus
Passive immunity, using pre-formed antitoxin, is the standard emergency treatment used against tetanus exposure.
Correct answer: A. Passive Immunity
Passive immunity is conferred by transferring pre-formed antibodies from one individual (or animal) to another, rather than the recipient producing their own.
Correct answer: D. Passive
Passive immunization, using pre-formed antibodies/antiserum, is used to combat active infections such as tetanus, rabies and snake envenomation, where immediate protection is needed.
Correct answer: A. Disulphide Bond
The two heavy chains and two light chains of an antibody molecule are linked together by disulphide bonds.
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