MCAT practice by topic

• chem-phys — 268 free questions
• bio-biochem — 231 free questions
• psych-soc — 179 free questions
• cars — 135 free questions

How do I study for the MCAT?

Content review alone fails — the MCAT rewards applied reasoning. Alternate content blocks with question practice from day one: KomFi gives you 3,481 MCAT practice questions with mechanism-level explanations, flashcards for the high-yield facts, and mock exams for stamina.

Is the MCAT harder than the GMAT or LSAT?

It is a different kind of hard: more content volume than any other graduate admissions exam, layered with passage-based reasoning. The candidates who win treat it like training — daily reps, honest accuracy tracking, and ruthless review of misses.

Where can I practice MCAT questions for free?

KomFi publishes free MCAT practice questions with full passage structure. KomFi Basic includes 50 MCAT questions every 2 weeks, explanations, introductory flashcards, and progress tracking. KomFi Pro unlocks the complete bank and full flashcard deck.

Free MCAT practice questions

1. What genetic term describes a single gene influencing multiple seemingly unrelated traits?
2. In the human ear, sound waves cause fluid in the cochlea to… — Which cells are responsible for converting thes
3. An electrophysiologist observes a neuron at its resting memb… — Which ion is primarily responsible for this de
4. A researcher discovers that a population of bacteria survives exposure to an antibiotic because a few individu
5. Which structure is most likely dysfunctional?
6. Which organelle would you expect to be exceptionally well-developed in these cells?
7. Which molecule acts as a 'fluidity buffer' in animal cell membranes?
8. A scientist is tracking the movement of a secreted protein. If the protein has just left the 'trans' face of t
9. A molecule moves into a cell against its concentration gradi… — This process is best described as:
10. A protein signal binding to a cell surface receptor leads to… — What is the expected outcome of this activatio
11. A population of flowers is in Hardy-Weinberg equilibrium. Th… — What is the frequency of the dominant allele
12. What is the frequency of the heterozygous genotype (2pq)?
13. A researcher is studying two genes that are located very clo… — This phenomenon is known as:
14. A test cross is performed by mating an individual of dominant phenotype but unknown genotype with an individua
15. A patient is admitted to the emergency department with a sev… — How does this patient's O_2 saturation at a ti
16. Which observation correctly explains the different O_2 binding behaviors?
17. A sprinter finishes a 400-meter dash and has an accumulation… — Which statement best describes the Bohr effect
18. Which of the following changes would result in a decrease in the P_50 value of hemoglobin?
19. What is the expected position of their oxygen-hemoglobin dissociation curve relative to the standard?
20. In the lung alveoli, the P_CO_2 is relatively low and the pH… — How do these conditions facilitate the functio
21. Which equation correctly illustrates the chemical basis for the 'acid' component of this shift?
22. Which of the following describes the immediate effect on the resting membrane potential of their neurons?
23. A patient with severe dehydration is likely to exhibit which of the following physiological responses to maint
24. During heavy exercise, a cyclist's heart rate increases to 1… — How does this change the duration of the cardi
25. Which cellular change occurs in the collecting duct cells to restore homeostasis?