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MCAT Practice Exam — with an explanation for every answer
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121 verified questions — built for serious drilling
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Free sample questions
5 original questions with a full explanation for every answer choice — try the first 3 free, no account needed. Create a free account to finish the sample and save your progress.
PASSAGE: An intravenous (IV) infusion delivers normal saline to a patient by gravity. A vented bag of saline hangs so that the fluid surface is a height h above the catheter tip in the patient's arm. Saline flows down tubing of length L and internal radius r before entering a vein. Treat saline as incompressible with density rho = 1.0 x 10^3 kg/m^3 and dynamic viscosity eta; use g = 10 m/s^2. Laminar flow in the tubing obeys Poiseuille's law, Q = pi*r^4*(P1 - P2)/(8*eta*L). Farther downstream the vein passes through a short constricted segment where its radius is temporarily reduced; there the fluid is modeled as an ideal fluid obeying the continuity equation and Bernoulli's equation.
For h = 1.0 m, the gauge pressure contributed by the column of saline at the level of the catheter tip is closest to:
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Chapter 1· free
Physics & General Chemistry Foundations
Fluids, electrochemistry, circuits, thermodynamics/kinetics, atomic & nuclear structure, optics, sound, and gas/solution equilibria as applied to living systems (Foundational Concept 4 and general-chemistry parts of Concept 5).
21 questions · 1 chapter quiz · ~32 min
Chapter 2
Organic Chemistry & Biomolecule Structure
Organic reaction mechanisms, functional-group spectroscopy, stereochemistry, and the chemistry of amino acids (Content Category 5D and related 1A structural chemistry).
15 questions · 1 chapter quiz · ~23 min
Chapter 3
Critical Analysis and Reasoning Skills (CARS)
Full-length humanities/social-science passages covering comprehension, within-text reasoning, and beyond-text reasoning, exactly as the real CARS section is structured (no content categories, skill-based only).
26 questions · 1 chapter quiz · ~39 min
Chapter 4
Molecular & Cell Biology, Biochemistry
Enzyme kinetics/inhibition, cellular respiration and oxidative phosphorylation, protein structure, membrane transport, signal transduction, and DNA replication (Content Categories 1A/1B/1D).
19 questions · 1 chapter quiz · ~29 min
Chapter 5
Genetics & Heredity
Mendelian inheritance, linkage and recombination mapping, Hardy-Weinberg population genetics, and meiosis-driven variation (Content Category 1C).
16 questions · 1 chapter quiz · ~24 min
Chapter 6
Psychological, Social, and Biological Foundations of Behavior
Sensation/perception, learning and memory, biological bases of behavior, and social psychology/sociology concepts (Foundational Concepts 6, 7, 8, 9, 10).
24 questions · 1 chapter quiz · ~36 min
Final test · 30 questions
Full MCAT diagnostic
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About this course
The real MCAT exam: ~7.5 hours · Chem/Phys, CARS, Bio/Biochem, Psych/Soc · scored 472-528. The free sample and Chapter 1 let you try the format; the full course covers every outline domain with chapter quizzes, a full-length diagnostic, and adaptive AI practice.
Every question is original, written from the published outline and public primary sources, and human-reviewed before publication — PrepTempo never reproduces actual exam content.
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MCAT practice exam FAQ
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Answer keys only tell you the letter. Explaining why wrong options fail is how concepts stick under timed pressure.
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