What's on the MCAT? Full Content Outline (2026)

Understanding what is on the MCAT is the single most important thing to do before you start studying. The AAMC publishes a detailed content outline describing the four sections, the foundational concepts and disciplines each section tests, and the approximate weighting of each discipline. This guide walks you through that outline in plain language, with the tested subjects, their approximate emphasis, and links to free practice questions.

The Medical College Admission Test (MCAT) is developed by the Association of American Medical Colleges (AAMC) and is required for admission to nearly every medical school in the United States and Canada. It is a computer-based exam of roughly 230 questions across four sections, taking about 7.5 hours in total (including breaks). A strong, well-targeted study plan starts with knowing exactly what the exam covers.

MCAT 2026 Exam Structure

Before diving into the content, here is the overall structure. The MCAT has four scored sections. Three of them are science sections; one (CARS) has no science content and instead tests reading and reasoning. Each section is scored from 118 to 132, and the four combine into a total score from 472 to 528. There is no penalty for wrong answers, so you should answer every question.

Most questions are grouped into passage sets (a short passage followed by several questions), with a smaller number of standalone "discrete" questions. Even in the science sections, the emphasis is on reasoning and data interpretation rather than pure recall — you are expected to apply foundational concepts to unfamiliar experimental and real-world scenarios.

Chemical & Physical Foundations (Chem/Phys)

The Chem/Phys section tests the physical and chemical principles that underlie living systems. It draws on four disciplines: general chemistry, physics, organic chemistry, and biochemistry, all framed in a biological context. Core content includes:

1. General Chemistry — Atomic structure, the periodic table, bonding, stoichiometry, thermodynamics, kinetics, equilibrium, acids and bases, and electrochemistry.
2. Physics — Kinematics and forces, work and energy, fluids, thermodynamics, electrostatics and circuits, waves and sound, and optics.
3. Organic Chemistry — Functional groups, isomerism, key reaction mechanisms, and separation/spectroscopy techniques relevant to biological molecules.
4. Biochemistry — Amino acids and proteins, enzyme kinetics, and the chemistry of metabolism (introduced here and shared with Bio/Biochem).

Fluids and electrochemistry are especially high-yield because they connect directly to physiology. Start your practice with Chem/Phys questions covering these disciplines.

Critical Analysis & Reasoning Skills (CARS)

CARS is unique: it contains no science content at all. Instead, it presents passages drawn from the humanities and social sciences and tests your ability to read carefully and reason about what you read. There is nothing to memorize — success comes from consistent, timed passage practice. The section assesses three broad skills:

1. Foundations of Comprehension — Understanding the basic and deeper meaning of a passage.
2. Reasoning Within the Text — Integrating ideas, evaluating the author's argument, and distinguishing evidence from conclusion.
3. Reasoning Beyond the Text — Applying passage ideas to new situations and assessing how new information affects the argument.

Because CARS improves mostly through practice, build a daily passage habit early. Sharpen these skills with our CARS practice passages.

Biological & Biochemical Foundations (Bio/Biochem)

This section tests the processes unique to living organisms, drawing primarily on biology and biochemistry, with supporting general and organic chemistry. It is heavily weighted toward biochemistry and molecular biology. Core content includes:

1. Biochemistry — Amino acids and protein structure/function, enzymes and enzyme kinetics, and the major metabolic pathways (glycolysis, the citric acid cycle, oxidative phosphorylation).
2. Molecular Biology — DNA and RNA structure, replication, transcription, translation, and gene regulation.
3. Cell Biology — Membrane structure and transport, organelles, the cell cycle, and cell signaling.
4. Physiology and Organ Systems — The nervous, endocrine, circulatory, respiratory, digestive, immune, and excretory systems.
5. Genetics and Evolution — Mendelian and molecular genetics, and the principles of natural selection.

Amino acids, enzymes, and metabolism are among the highest-yield topics anywhere on the MCAT. Practice with our Bio/Biochem question bank.

Psychological, Social & Biological Foundations of Behavior (Psych/Soc)

This section tests how psychological, social, and biological factors influence behavior and health. It draws mainly on introductory psychology and sociology, with a smaller biology component. Terminology and theory recognition matter here more than in the other sections. Core content includes:

1. Psychology — Sensation and perception, learning and memory, cognition, motivation and emotion, personality theories, and psychological disorders.
2. Sociology — Social structures and institutions, socialization, group dynamics, culture, and social inequality (including how it affects health).
3. Biological Basis of Behavior — The nervous and endocrine systems' roles in behavior, and the biology of stress.

A large share of this section rewards knowing the vocabulary of psychology and sociology and recognizing the right theory in context. Explore practice questions by section and topic.

The 10 AAMC Foundational Concepts

Underneath the four sections, the AAMC organizes everything the MCAT tests into 10 Foundational Concepts — big-picture ideas that each section is built around. Every Foundational Concept is then broken down into content categories (labeled 1A, 1B, 5C, and so on) that list the specific topics you are responsible for. When people talk about "the AAMC content outline," these Foundational Concepts and content categories are exactly what they mean. Three of the sections map to these concepts; CARS is skills-based and has none.

Here is a plain-language summary of all 10 Foundational Concepts:

1. FC 1: Biomolecules have unique properties that determine how they build cells and drive the processes that sustain life.
2. FC 2: Organized assemblies of molecules, cells, and organs interact to carry out the functions of living organisms.
3. FC 3: Complex tissues and organs sense the internal and external environment and maintain homeostasis.
4. FC 4: Living organisms transport materials, sense their environment, and respond to change through physical principles.
5. FC 5: The principles governing chemical interactions and reactions underlie the molecular dynamics of living systems.
6. FC 6: Biological, psychological, and sociocultural factors influence how individuals perceive and react to the world.
7. FC 7: Biological, psychological, and sociocultural factors influence behavior and behavior change.
8. FC 8: Psychological, sociocultural, and biological factors influence how we think about ourselves and others and how we interact.
9. FC 9: Cultural and social differences influence well-being.
10. FC 10: Social stratification and unequal access to resources influence well-being.

Alongside the Foundational Concepts, the AAMC also lists four Scientific Inquiry and Reasoning Skills (SIRS) that every science question draws on: knowledge of scientific concepts, scientific reasoning and problem-solving, reasoning about the design and execution of research, and data-based statistical reasoning. This is why the MCAT rewards applying concepts and interpreting experiments rather than pure memorization.

Approximate Weighting of the Disciplines

The AAMC describes roughly how much of each science section comes from each discipline. Knowing the approximate emphasis helps you allocate study time. The figures below are approximate and reflect the AAMC's published guidance.

Across the whole exam, biochemistry appears in two sections (Chem/Phys and Bio/Biochem), which is why it is often called the highest-yield subject on the MCAT. Prioritize it accordingly.

Section-by-Section Preparation Tips

Chem/Phys Tips

• Understand concepts, don't just memorize equations. The MCAT tests what happens when a variable changes, not plug-and-chug.
• Practice without a calculator. No calculator is allowed, so build estimation and scientific-notation skills.
• Learn the physiology links. Fluids, pressure, and circuits often appear in biological contexts.
• Prioritize biochemistry and general chemistry, the heaviest disciplines in this section.

CARS Tips

• Practice daily. One or two passages a day builds the reasoning muscle over time.
• Answer only from the passage. Never bring in outside knowledge; the "best supported" answer is the correct one.
• Time yourself. Pacing is the biggest challenge — aim for a consistent per-passage rhythm.

Bio/Biochem Tips

• Master amino acids, enzymes, and metabolism. These are the highest-yield topics in the section.
• Learn to read experiments. Many questions hinge on interpreting graphs, tables, and experimental design.
• Connect molecular biology to physiology, since passages often integrate multiple systems.

Psych/Soc Tips

• Build vocabulary. Recognizing the right term or theory is often the whole question.
• Use flashcards for psychology and sociology terminology and named theories.
• Link concepts to health, since the section frames behavior around well-being and disparities.

How to Use This Content Outline Effectively

Knowing the outline is the first step. Here is how to turn it into a strong MCAT score:

1. Map the outline to your review resources and check off foundational concepts as you cover them.
2. Do a full content pass, then a second review pass paired with practice questions.
3. Pair each topic with question practice using our subject-wise question banks, organized by section and topic.
4. Take regular full-length practice tests with our timed practice to build stamina and pacing.
5. Keep a content log of missed questions and review it weekly to target weak areas.

Frequently Asked Questions

How many sections does the MCAT have?

Four scored sections: Chem/Phys, CARS, Bio/Biochem, and Psych/Soc. Each is scored from 118 to 132, and they combine into a total score from 472 to 528.

What is a good MCAT score?

The midpoint of the scale is around 500 (roughly the 50th percentile). Scores around 515 fall near the 90th percentile, and around 520 near the 97th. The average score for students who matriculate to US medical schools is around 511-512.

Is there a penalty for wrong answers on the MCAT?

No. Your score is based only on correct answers, so you should answer every question even if you have to guess.

How long should I prepare for the MCAT?

Most examinees prepare for roughly three to six months, studying several hundred hours total. Your timeline depends on your content background, target score, and how much time you can commit each week.