MDCAT Immunity MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
1
Selected Topics
1
Available MCQs
756
Question Limit
Up to 180
Select Topics to Practice
Questions will be drawn only from checked topics.
Test Configuration
Configure question count (limit 180) and testing mode.
Selected topics have 756 total questions. Test will draw 50 shuffled MCQs.
Sample Immunity MCQs with answers
Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.
Specific Immunity
1. Humoral immunity is carried by a special group of cells called:
- A. B-cells
- B. Killer cells
- C. Helper cells
- D. Null cells
View answer and explanation
Answer: A. B-cells
This question tests humoral immunity. Humoral (antibody-mediated) immunity is carried out by B-cells (B lymphocytes), which differentiate into plasma cells that secrete antibodies. Killer and helper cells are T-cells of cell-mediated immunity, and null cells are a separate category.
Specific Immunity
2. The third line of defense is based upon the white blood cells called:
- A. Neutrophils
- B. Monocytes
- C. Basophils
- D. Lymphocytes
View answer and explanation
Answer: D. Lymphocytes
Which white blood cells drive acquired immunity? While neutrophils, monocytes, and basophils are important in innate (second line) immunity, particularly phagocytosis and inflammation, the third line of defense (acquired immunity) is specifically based on lymphocytes, meaning T-cells and B-cells. Why is this distinction useful? Recognizing which white blood cell types belong to which line of defense helps in correctly answering many related MDCAT questions about immune cell function. MDCAT Point Lymphocytes (T-cells and B-cells) are the white blood cells responsible for the third line of defense (acquired immunity).
Specific Immunity
3. Small pox vaccine was first discovered by
- A. Edward Jenner
- B. Lister
- C. Louis Pasteur
- D. Robert Koch
View answer and explanation
Answer: A. Edward Jenner
Edward Jenner discovered the smallpox vaccine in 1796 by inoculating with cowpox, establishing the principle of vaccination. Lister developed antisepsis, Pasteur developed the rabies and anthrax vaccines later, and Koch worked on bacterial pathogens. Hence Jenner is correct.
About this unit
MDCAT Immunity — Unit 12
756 practice MCQs covering Specific Immunity. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Immunity practice
How many Immunity MCQs are available on DIFF. MDCAT?
The current Immunity question bank contains 756 practice MCQs across 1 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Immunity quiz cover?
The selectable topics are Specific Immunity. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Immunity test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Immunity quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Immunity MCQs to improve?
Start with a short tutor drill on one of these topics: Specific Immunity. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.