MDCAT Biology — Immunity
Immunity is a core Biology topic in the PMDC MDCAT syllabus, covering 3 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (3)
- Human Physiology - Immune System
- Non-Specific Defense Mechanism
- Specific Defense Mechanism
How Immunity is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Immunity accounts for 48 questions. It appears in 13 of them, about 3.7 questions a paper. The heaviest was MDCAT 2014, with 7 questions, and the most recent is MDCAT 2025, with 2.
| Paper | Questions |
|---|---|
| MDCAT 2025 | 2 |
| MDCAT 2023 | 2 |
| MDCAT 2022 | 2 |
| MDCAT 2019 | 4 |
| MDCAT 2018 | 2 |
| MDCAT 2017 | 3 |
| MDCAT 2016 | 5 |
| MDCAT 2015 | 4 |
| MDCAT 2014 | 7 |
| MDCAT 2013 | 4 |
| MDCAT 2012 | 6 |
| MDCAT 2011 | 6 |
| MDCAT 2009 | 1 |
Immunity MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2025 · Immunity
Which of the following best highlights the importance of proteins in immunity?
- A.They act as receptors of pathogens
- B.They are long term energy reserves
- C.They act as antibodies
- D.They act as mechanical barrier for pathogens
Show answer
Answer: C. They act as antibodies — Proteins act as antibodies, a key part of the immune response.
- Q2 · MDCAT 2023 · Immunity
The final destination of lymph is:
- A.Lymph node
- B.Lymphoid organs
- C.Lymph capillaries
- D.Subclavian vein
Show answer
Answer: D. Subclavian vein — Lymph's final destination is the bloodstream, which it rejoins via the subclavian vein.
- Q3 · MDCAT 2022 · Immunity
------------ proteins are produced by WBCs in response to --------- and provide immunity?
- A.Antibiotics, antigen
- B.Antibodies, RBC
- C.Globulin, histamine
- D.Antibodies, antigen
Show answer
Answer: D. Antibodies, antigen — Antibodies are produced by WBCs (B-lymphocytes/plasma cells) in response to antigens, providing immunity.