The MCAT Exam Blueprint

Part of The MCAT. The short version of the exam is four sections. The useful version is understanding what each section is actually asking you to do. This page gives you the map, then lets you open the more detailed version when you need it.

You do not need to memorize this entire page. Use it as a reference map when you want to see what each section covers and how the pieces fit together.

The short version

The MCAT is not one giant biology test. It is four sections that ask you to combine content knowledge with reading, reasoning, and scientific problem-solving.

You will need to know material from biology, biochemistry, chemistry, physics, psychology, and sociology. You will also need to read a passage or study, interpret a figure, identify what changed in an experiment, and decide which answer is actually supported. You have to do that for a long time, under a clock.

That combination is what makes the exam feel different from many college classes. The content matters. So does recognizing how the question is asking you to use it.

The four sections

The AAMC publishes the whole blueprint, and everything below is drawn from it rather than from a prep company's summary of it.1

Section Questions Time What you are doing
Chemical and Physical Foundations of Biological Systems 59 95 minutes Applying chemistry, physics, and biochemistry to living systems
Critical Analysis and Reasoning Skills (CARS) 53 90 minutes Comprehending, analyzing, and reasoning through passages
Biological and Biochemical Foundations of Living Systems 59 95 minutes Applying biology and biochemistry to living systems
Psychological, Social, and Biological Foundations of Behavior 59 95 minutes Applying behavioral, social, and biological concepts to health and behavior

The current content time is 6 hours and 15 minutes. Total time in the testing seat is about 7 hours and 30 minutes once the tutorial, breaks, and other administrative pieces are included. ⟳ Verify the current structure with the AAMC before you plan around it.

You can use this table as your orientation. The rest of the page is here for the student who wants to know what sits underneath those four labels.

What the science sections have in common

The three science sections are built from two layers:

  1. Content knowledge. The biology, chemistry, physics, biochemistry, psychology, and sociology you are expected to bring to the question.
  2. Scientific inquiry and reasoning. The skills you use to interpret a problem, study, figure, or experiment.

The AAMC organizes much of the science content around ten Foundational Concepts. Think of them as large organizing ideas, not ten separate textbooks. Questions can combine several disciplines and more than one Foundational Concept at a time.

This matters for how you study. You should know the content categories, but you should also practice seeing how the pieces connect. A question about a receptor might require biology, biochemistry, chemistry, and data interpretation in the same passage.

The ten Foundational Concepts

The concepts, the categories under them, and the course backgrounds they assume are the AAMC's own, published as a downloadable outline.2

Biological and Biochemical Foundations

Foundational Concept 1: Biomolecules have properties that determine how they build cells and support life.

This includes proteins and amino acids, genetic information, heredity, and the ways cells use and store energy.

Foundational Concept 2: Organized molecules, cells, and organs work together to carry out the functions of living organisms.

This includes cell structure, membranes, transport, prokaryotes and viruses, cell division, differentiation, and specialization.

Foundational Concept 3: Tissues and organ systems sense their environments and work together to maintain stability, growth, and reproduction.

This includes the nervous and endocrine systems, homeostasis, and the structure and integration of the major organ systems.

Chemical and Physical Foundations

Foundational Concept 4: The transport of materials, energy, and signals through living systems depends on chemical and physical principles.

This is where physics becomes connected to physiology. Fluids, circulation, gas exchange, electricity, light, sound, atoms, and nuclear decay can all appear in the context of living systems.

Foundational Concept 5: Chemical and physical principles govern the interactions and processes that make life possible.

This includes water and solutions, chemical interactions, thermodynamics, kinetics, equilibrium, acids and bases, and the chemistry of biological molecules.

Psychological, Social, and Biological Foundations of Behavior

Foundational Concept 6: Biological, psychological, and sociocultural factors influence the ways people perceive, think about, and react to the world.

The categories here include sensing the environment, making sense of the environment, and responding to the world.

Foundational Concept 7: Biological, psychological, and sociocultural factors influence behavior and behavior change.

The categories include individual influences on behavior, social processes that influence behavior, and attitude and behavior change.

Foundational Concept 8: Psychological, sociocultural, and biological factors influence how people understand themselves and others and how they interact.

The categories include self-identity, social thinking, and social interactions.

Foundational Concept 9: Cultural and social differences influence well-being.

The categories include understanding social structure and demographic characteristics and processes.

Foundational Concept 10: Social stratification and access to resources influence well-being.

The category here is social inequality.

These concepts are useful because they give the material some shape. You still have to learn the details, but now they have somewhere to go.

The four scientific reasoning skills

The science sections also test four reasoning skills.3 This is the part that gets lost when someone builds a study plan out of topic names alone.

1. Knowledge of scientific concepts and principles

You need to understand scientific concepts, principles, and the relationships between them. This is the content foundation. If you do not know what a variable represents, it is hard to reason well with a graph that contains it.

2. Scientific reasoning and problem-solving

You need to use scientific principles, theories, and models to explain what is happening, make a prediction, or choose between competing explanations.

Knowing an equation is different from knowing when the equation applies.

3. Reasoning about the design and execution of research

You need to understand how an experiment or study was built. That includes the question being asked, the variables being changed or measured, the controls, the sample, and the limits of the design. Questions can also ask you to reason about research methods and ethics.

4. Data-based and statistical reasoning

You need to read tables, figures, and graphs and draw conclusions from data. You may need to compare groups, identify a trend, understand uncertainty, or notice that the conclusion goes further than the evidence allows.

The practical takeaway is simple: content review and practice questions are doing different jobs. You need both. One gives you the language. The other teaches you how the test uses that language.

CARS is different

CARS does not ask you to bring a list of science facts. It gives you passages from the humanities and social sciences and asks you to understand and reason from what you read.4

The section has three related skills:

Foundations of Comprehension

Understand what the passage says, what its words mean in context, and how its ideas fit together.

Reasoning Within the Text

Follow the author's argument. Identify the author's position, connect parts of the passage, and distinguish what the author says from what you personally think.

Reasoning Beyond the Text

Draw an inference that the passage supports or apply the passage's reasoning to a new situation without importing outside assumptions.

CARS passages can draw from areas such as ethics, philosophy, social sciences, population health, and studies of different cultures. You do not need to become an expert in those subjects before test day. The information needed to answer the questions should come from the passage.

That does not make CARS easy. It makes it a different kind of work. The CARS guide goes deeper into how to practice it.

The content categories and course backgrounds

The AAMC content outline is more detailed than the ten Foundational Concepts. It also identifies the content categories and the college courses that feed them.

At a broad level, the science sections draw from:

  • biology;
  • biochemistry;
  • general chemistry;
  • organic chemistry;
  • physics;
  • psychology; and
  • sociology.

Some topics appear in more than one section. That is not necessarily a mistake. The same underlying idea can be tested differently depending on the section and the question. A membrane can be a biology question, a chemistry question, or a question about transport and physics.

The detailed reference index

If you want the complete checklist, the current AAMC categories are grouped like this:

  • Foundational Concept 1: 1A, Structure and function of proteins and their constituent amino acids; 1B, Transmission of genetic information from the gene to the protein; 1C, Transmission of heritable information from generation to generation and the processes that increase genetic diversity; and 1D, Principles of bioenergetics and fuel molecule metabolism.
  • Foundational Concept 2: 2A, Assemblies of molecules, cells, and groups of cells within single cellular and multicellular organisms; 2B, The structure, growth, physiology, and genetics of prokaryotes and viruses; and 2C, Processes of cell division, differentiation, and specialization.
  • Foundational Concept 3: 3A, Structure and functions of the nervous and endocrine systems and ways in which these systems coordinate the organ systems; and 3B, Structure and integrative functions of the main organ systems.
  • Foundational Concept 4: 4A, Translational motion, forces, work, energy, and equilibrium in living systems; 4B, Importance of fluids for the circulation of blood, gas movement, and gas exchange; 4C, Electrochemistry and electrical circuits and their elements; 4D, How light and sound interact with matter; and 4E, Atoms, nuclear decay, electronic structure, and atomic chemical behavior.
  • Foundational Concept 5: 5A, Unique nature of water and its solutions; 5B, Nature of molecules and intermolecular interactions; 5C, Separation and purification methods; 5D, Structure, function, and reactivity of biologically-relevant molecules; and 5E, Principles of chemical thermodynamics and kinetics.
  • Foundational Concept 6: 6A, Sensing the environment; 6B, Making sense of the environment; and 6C, Responding to the world.
  • Foundational Concept 7: 7A, Individual influences on behavior; 7B, Social processes that influence human behavior; and 7C, Attitude and behavior change.
  • Foundational Concept 8: 8A, Self-identity; 8B, Social thinking; and 8C, Social interactions.
  • Foundational Concept 9: 9A, Understanding social structure; and 9B, Demographic characteristics and processes.
  • Foundational Concept 10: 10A, Social inequality.

This index deliberately stops at the category level. Every category above opens into topics and subtopics in the official document, and if you are deciding where a weak area lives, that is the level to read. The AAMC content outline is the source of truth, and the category wording changes from time to time, so check it against the current outline rather than against this page. The Study Plan is where these categories turn into a schedule.

What this means for your preparation

The blueprint is not a schedule. It does not tell you to spend exactly three days on acids and bases or exactly one week on psychology. It gives you a way to see what the schedule needs to contain.

You need time to learn the underlying material. You need time to retain it. You need practice applying it to unfamiliar questions. You need to review your mistakes, not just count the questions you completed. And you need to practice doing this while tired enough that the real exam does not feel like a surprise.

That is why I would not start by copying every line of the AAMC outline into a calendar. Start with the map. Use a diagnostic full-length to see where you are. Then use the detailed categories to find the gaps in your knowledge and the question review to find the gaps in your reasoning.

The Study Plan explains how to turn this blueprint into a repeatable routine. The Resource Tier List can help you choose materials without buying every resource you see. The When to Take It guide helps you decide when the work fits your application timeline.

What this page cannot tell you

  • It cannot predict your score.
  • It cannot tell you which commercial course to buy.
  • It cannot tell you how long each topic will take you to learn.
  • It cannot replace practice questions and full-length review.
  • It cannot make the application timeline work if the preparation hours do not exist.

The map is useful. You still have to be honest about the road in front of you.

The MCAT structure, content outline, category labels, and official resources can change. Verify current details with the AAMC before planning or registering. This page is educational information, not testing or admissions advice. — Last reviewed: 2026-08-06

References

Footnotes

  1. AAMC, What's on the MCAT Exam? ↩

  2. AAMC, What's on the MCAT? PDF Outline ↩

  3. AAMC, Scientific Inquiry and Reasoning Skills ↩

  4. AAMC, CARS Section Overview ↩