The IMAT Biology Section Explained (23 of 60 Questions)

Biology is 23 of the IMAT's 60 questions, the single largest section on the exam by a wide margin, and yet most candidates walk in only half-sure what the section actually looks like beyond "a lot of biology."

We hear some version of "how do I study for biology" constantly, but it's rarely followed by a question about what the section actually rewards. That's the part worth slowing down on, because it changes how you should be spending your hours, not just how many of them.

The IMAT biology section is 23 of 60 questions covering cell biology, genetics, human physiology, microbiology, and evolution, mixing pure recall questions with applied questions built around diagrams, passages, or data. It rewards breadth and the ability to reason through unfamiliar formats, not just memorized facts.

What the section actually looks like on the page

It isn't 23 questions pulled from one neat chapter list. It's a spread across cell biology, genetics, human physiology by organ system, microbiology, and evolution, with no fixed ratio between them from year to year. Some questions are pure recall: name the structure, identify the process. Others hand you a short passage, a labeled diagram, or a data table and ask you to reason through it rather than remember it. Both types count as "biology," and they reward genuinely different skills.

The two question types hiding inside one section

Recall questions are the ones most candidates prepare for by default, because they respond well to flashcards and repetition. Applied questions are the ones that quietly separate strong scores from average ones, because no amount of memorized facts helps if you can't read a diagram correctly under time pressure. A candidate who knows the material cold but has never practiced this specific question format still loses points here, not from a knowledge gap but from an unfamiliar format meeting a ticking clock.

Why the section feels bigger than 23 questions

Twenty-three questions sounds manageable until you notice how many distinct sub-disciplines feed into it. Chemistry has a defined syllabus you can largely exhaust. Biology's breadth means you're never fully "done," and candidates who treat it like a finite checklist tend to over-invest in one sub-area, usually genetics or cell biology, while under-preparing physiology, which shows up just as often and just as unpredictably.

How to actually study it, given all that

Work backward from frequency, not from a textbook's table of contents. Go through past papers and tag which systems and mechanisms actually recur, then weight your study time toward those first, filling in the long tail of less common topics later, only once the high-frequency material is solid. Mix recall practice with genuinely applied, diagram-based questions from the start, rather than saving that format for the final weeks. Trying to cram it in at the end is exactly what makes it feel unfamiliar on test day.

Biology earns its size on the exam. Respect the breadth, practice the applied format on purpose, and it stops being the section that quietly eats the most study time for the least return.