The MCAT tests seven core subjects: biology, biochemistry, general chemistry, organic chemistry, physics, psychology, and sociology.
These are spread across four sections, not seven.
Finding which subject lands where helps you stop overstudying the wrong things.
As someone building a study plan, this breakdown saves real prep time. Focus on what the exam actually tests, and your score reflects that effort.
What Is the MCAT?
The MCAT, or Medical College Admission Test, is a standardized exam required for admission to MD and DO programs across the United States and Canada.
It tests scientific knowledge, critical thinking, and reasoning skills that medical schools look for in applicants.
To sit for the MCAT, you generally need to:
- Be planning to apply to a U.S. or Canadian medical school
- Be currently enrolled in or have completed a bachelor’s degree
- Have a solid foundation in the core science subjects the exam covers
There is no strict age limit for registration.
What Each MCAT Section Tests and Why It Matters
The MCAT has four sections, each of which draws from specific subjects. Break it down, and it becomes much easier to study with a clear target.
1. Biological and Biochemical Foundations of Living Systems
It covers biology and biochemistry. It tests how living systems function, from cellular processes to full organ-system function. Expect questions on DNA replication, enzyme activity, genetics, and physiology.
The AAMC built this section around the biological knowledge base that doctors use daily.
2. Chemical and Physical Foundations of Biological Systems
It tests general chemistry, organic chemistry, physics, and some biochemistry. Questions focus on scientific reasoning and applying formulas in a biological context.
Fluid dynamics, acid-base chemistry, and reaction mechanisms often appear. You won’t just recall facts. You’ll apply principles to new scenarios.
3. Psychological, Social, and Biological Foundations of Behavior
It basically covers psychology, sociology, and behavioral biology. It includes neurotransmitters, cognitive development theories, health disparities, and social determinants of health.
Medical schools added this section in 2015 because understanding patients goes beyond mere knowledge of science.
4. Critical Analysis and Reasoning Skills (CARS)
It uses humanities and social science passages to test reading comprehension, critical thinking, and argument analysis. Everything needed to answer questions is inside the passage.
Outside knowledge won’t help here. What will help is the ability to read closely, spot the author’s main point, and identify how arguments are structured.
Many strong science students find CARS the hardest section simply because it cannot be memorized or crammed. Regular reading of dense, complex material is the only reliable way to build this skill over time.
Breaking Down the 7 MCAT Subjects: How They’re Grouped
Students who understand the exam’s structure before opening a review book consistently build stronger study plans.
That’s not an opinion. It’s a pattern that keeps popping up in MCAT prep.
The 7 subjects on the MCAT are biology, biochemistry, general chemistry, organic chemistry, physics, psychology, and sociology.
They’re grouped across four sections:
- Section 1: Biology and biochemistry, with some general chemistry overlap
- Section 2: General chemistry, organic chemistry, and physics
- Section 3: Psychology and sociology
- Section 4: Critical Analysis and Reasoning Skills, no science content at all
Understanding the 7 subjects on the MCAT and where each one appears is not just useful background information.
It is the foundation of a smarter, more efficient study plan. Time is limited in MCAT prep.
The exam runs about 7.5 hours with 230 total questions, most passage based.
How the MCAT Sections Are Structured
Each section is scored between 118 and 132. The total score ranges from 472 to 528, with 500 as the midpoint.
| Section | Questions | Time |
|---|---|---|
| Biological & Biochemical Foundations | 59 | 95 minutes |
| Chemical & Physical Foundations | 59 | 95 minutes |
| Psychological & Social Foundations | 59 | 95 minutes |
| CARS | 53 | 90 minutes |
One practical tip: practice each section under timed conditions from the start. Knowing the material is one thing. Knowing it under pressure, with a clock running, is what test day actually requires.
The 7 Subjects on the MCAT: Section-by-Section
Each of the 7 subjects on the MCAT has a specific place within the exam. Knowing what each one covers helps you study with a clear target.
1. Biology
Appears mainly in Section 1, with some presence in Section 3 through behavioral biology. Core areas:
- Cell biology: Organelles, membrane transport, mitosis, meiosis
- Genetics: Mendelian inheritance, mutations, gene expression
- Molecular biology: DNA replication, transcription, translation
- Physiology: Cardiovascular, respiratory, renal, nervous, and immune systems
- Microbiology: Bacterial and viral structure, immune responses
Most questions apply concepts to clinical scenarios, such as feedback loops and organ system interactions.
2. General Chemistry
Primarily in Section 2, with acid-base chemistry crossing into Section 1.
- Stoichiometry: Balancing reactions, mole concept, limiting reagents
- Acids and bases: pH, buffers, titrations, Henderson-Hasselbalch equation
- Thermodynamics: Enthalpy, entropy, Gibbs free energy
- Electrochemistry: Redox reactions, galvanic cells
- Solutions: Molarity, colligative properties, solubility
The focus is on applying chemistry to biological systems, not solving equations in isolation.
3. Organic Chemistry
Tested across Section 1 and Section 2, focused on biomolecule-relevant reactions.
- Functional groups: Alcohols, aldehydes, ketones, carboxylic acids, amines
- Stereochemistry: Chirality, R/S configuration, isomers
- Reactions: Substitution, elimination, addition, oxidation-reduction
- Lab techniques: Chromatography, IR, and NMR spectroscopy
Expect questions that connect reaction patterns to biochemical pathways.
4. Physics
Tested entirely in Section 2, connected to biological and medical contexts.
- Fluids: Bernoulli’s equation, Pascal’s law, blood flow
- Electricity: Circuits, Coulomb’s law, Ohm’s law
- Waves and sound: Doppler effect, ultrasound
- Light and optics: Refraction, lenses, mirrors, vision correction
- Work and energy: Conservation of energy, kinetic and potential energy
Fluid dynamics appears most often. Know how it connects to cardiovascular function.
5. Biochemistry
One of the heaviest subjects among the 7 subjects on the MCAT is concentrated in Section 1.
- Amino acids and proteins: All 20 amino acids, protein structure, and denaturation
- Enzymes: Michaelis-Menten kinetics, Vmax, Km, inhibition types
- Carbohydrates: Glycolysis, gluconeogenesis, fermentation
- Lipids: Fatty acids, phospholipids, membrane structure
- Metabolism: ATP production, oxidative phosphorylation, metabolic regulation
Questions test how mutations or drug effects alter enzyme activity and metabolic pathways.
6. Psychology
Tested throughout Section 3, going well beyond basic theory.
- Biological bases: Neurotransmitters, brain structures, stress response
- Learning and memory: Conditioning, memory types, encoding, and retrieval
- Cognition: Attention, decision making, sleep disorders
- Abnormal psychology: Anxiety, depression, schizophrenia, PTSD, basic treatments
Questions link psychological concepts directly to health outcomes.
7. Sociology
Makes up roughly 30% of Section 3 and is commonly understudied.
- Social stratification: Class, race, gender, disability, and health effects
- Health disparities: Social determinants of health, healthcare access, and poverty
- Culture and socialization: Norms, values, cultural change
- Social change: Public health campaigns, diffusion of innovations
Questions ask you to interpret social data and connect social factors to patient health outcomes.
Final Thoughts
Understanding the 7 subjects on the MCAT is not just useful background knowledge.
It directly shapes how you prepare. Students who know what each section tests spend their time more efficiently and walk into test day with far more confidence.
The MCAT rewards strategy over memorization.
Consistent, focused preparation beats last-minute cramming every time. Start with a diagnostic, study the subjects in proportion to their weight, and practice applying concepts rather than just recalling them.
