IMAT Biology: The Topics You Actually Need to Know
Biology is the biggest section on the IMAT — 23 questions out of 60. It's also the section where students most often make the same strategic mistake: trying to study all of it equally.
The IMAT Biology syllabus is long. If you try to cover everything to the same depth, you'll run out of time before you've mastered the areas that actually appear on the exam. The students who score well on Biology are the ones who identify the high-frequency topics early and go deep on those first.
Here's what those topics are, based on analysis of every paper from 2020 to 2025.
The topics that appear almost every year
Cell biology and cell division
This is the highest-yield area on IMAT Biology. Cell structure, the functions of organelles, the cell membrane, and cell cycle regulation appear consistently. Mitosis and meiosis are tested in detail — not just the phases but the significance of each, the differences between them, and what happens when things go wrong. Non-disjunction, polyploidy, and chromosome abnormalities have all appeared in recent papers.
Genetics and inheritance
Mendelian genetics, dominant and recessive inheritance, codominance, sex-linked traits, and basic probability calculations are all testable. DNA replication, transcription, and translation are covered every year in some form. Know the structure of DNA and RNA, the role of each type of RNA, and the genetic code. Mutations (point mutations, frameshift mutations, chromosomal rearrangements) appear regularly.
Human physiology — the systems that come up most
The muscular system, circulatory system, and nervous system are the three most heavily tested physiological areas. For digestion: know the metabolism and the whole process of muscle contraction. For circulation: heart anatomy, the cardiac cycle, blood pressure regulation, and the differences between arteries, veins, and capillaries. For the nervous system: neuron structure, synaptic transmission, the autonomic nervous system.
Biochemistry — enzymes and metabolism
Enzyme kinetics, factors affecting enzyme activity, and inhibition types (competitive vs non-competitive) appear frequently. ATP synthesis, glycolysis, and the basic steps of cellular respiration are tested. Photosynthesis appears less often but the light-dependent and light-independent reactions are still worth knowing.
The topics that appear less often but are worth knowing
Biotechnology, evolution or tissues. All of them rarely appear on the exam and are considered to be relatively easy. If you're short on time, they're the ones to deprioritise.
How to study Biology for the IMAT
Reading through a textbook and highlighting is not enough. You need to be able to retrieve this information accurately under time pressure, not just recognise it when you see it. The difference is significant.
For high-yield topics: use active recall. Close your notes, draw the process from memory, label it, check it, do it again. For cell division, draw mitosis and meiosis from scratch multiple times until you can do it without thinking. For genetics, work through inheritance problems without looking at the solutions first.
Past paper questions are essential. For each Biology question you get wrong, identify whether it was a knowledge gap or a reasoning error. Knowledge gaps need content revision. Reasoning errors need more practice with similar question types instead of more passive reading.
A note on depth vs breadth
IMAT Biology questions are very diverse. You need to be able to explain different mechanism and quickly recall various details. This means you need to understand the material, not just memorise it. Ask yourself why after every fact: why does competitive inhibition reduce Vmax? Why does meiosis produce four cells instead of two? Why does the left ventricle have thicker walls? Understanding the mechanism makes the question answerable even when the specific scenario is unfamiliar.
