MDCAT — Biology MCQs
Practice 993 Biology past-paper MCQs for MDCAT, each with a detailed explanation and reference. Try free samples below, then start a full quiz.
Part of the full MDCAT QBank — 2,811 questions across all subjects.
Biology carries 45% of the MDCAT paper — more than Chemistry and Physics combined — making it the single highest-leverage subject to get right.
Work through Biology in Tutor mode to learn as you go, or switch to Timed mode to simulate real exam pressure. Your accuracy is tracked per subject, so you always know whether Biology is a strength to maintain or a weak area to drill.
High-Yield Biology Topics
Human physiology
the largest cluster within Biology — digestive, respiratory, circulatory, excretory and nervous systems all draw questions every year
Cell biology & biochemistry
membrane transport, mitosis/meiosis, enzyme kinetics and DNA replication are consistently tested
Genetics
Mendelian crosses, codominance, sex-linked inheritance and chromosomal abnormalities
Ecology & evolution
population dynamics, nutrient cycles and natural selection
Reproduction & immunity
gametogenesis, the immune response, and vaccine mechanisms
Sample Biology Questions
Which of the following diseases can be prevented through vaccination?
- A.AIDS and Cancer
- B.Malaria and AIDS
- C.Typhoid and Cancer
- D.Measles and Mumps
Newly produced cells/individuals which are identical in each other are known as
- A.Genetically Modified
- B.Transgenic Animals
- C.Transgenic Bacteria
- D.Clones
Which of the following is a blood borne disease?
- A.Hepatitis
- B.Cholera
- C.Influenza
- D.Candidiasis
Sign in to see the correct answers and detailed explanations for every question.
Ready to master Biology?
Start with 20 free questions — no card required.
Start free trial