Biochemistry is one of the most heavily tested subjects on the MCAT, woven through the biology and chemistry sections. This guide covers the high-yield topics to prioritize, explains why biochemistry carries so much weight, and outlines how to study it effectively.
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update Updated October 2026
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check_circleBiochemistry is one of the most heavily represented subjects on the MCAT.
check_circleAmino acids and protein structure are foundational and frequently tested.
check_circleEnzymes, kinetics, and inhibition are high-yield.
check_circleCore metabolism (glycolysis, TCA, oxidative phosphorylation) is essential.
check_circleStudy biochemistry through application and practice passages, not memorization alone.
Why Biochemistry Matters on the MCAT
Biochemistry appears prominently in two MCAT sections β the Biological and Biochemical Foundations section and the Chemical and Physical Foundations section β making it one of the most represented subjects overall. The exam tests it in an applied, experiment-based way, expecting you to interpret data and reason through unfamiliar scenarios rather than simply recall facts, so a solid conceptual foundation pays off across the test.
High-Yield Topics
Prioritize the topics that appear most. Amino acids and protein structure (the twenty amino acids, their properties, and the levels of protein structure) are foundational. Enzymes are heavily tested, including mechanisms, Michaelis-Menten kinetics, and the types of inhibition. Core metabolism β glycolysis, the citric acid cycle, oxidative phosphorylation, and their regulation β is essential, along with carbohydrate, lipid, and nucleotide fundamentals and common laboratory techniques.
How to Study Biochemistry
Because the MCAT applies biochemistry rather than testing rote recall, study it actively. Build understanding of pathways and enzyme logic first, then reinforce facts with spaced repetition (for example, amino acid properties). Do plenty of practice passages, especially AAMC material, to train experiment interpretation and data analysis. Connecting biochemistry to physiology and to the other sciences deepens the understanding the exam rewards.
Common Pitfalls
A frequent mistake is memorizing pathways in isolation without understanding their regulation or purpose, which fails on application questions. Another is neglecting amino acids and enzyme kinetics, which are reliably tested. Finally, students often under-practice with passages; because the MCAT presents biochemistry through experiments and figures, practicing that format is as important as knowing the content.
Straight from the Progress Note question bank, each with a cited explanation. No account needed.
123
Coenzyme A (CoA) plays a central role in metabolism, most familiarly as acetyl-CoA. What is its primary function?
Answer: E. Coenzyme A is a coenzyme whose reactive thiol (βSH) group forms high-energy thioester bonds with acyl groups, letting it carry and transfer those groups β most notably as acetyl-CoA β between metabolic reactions, for example delivering the two-carbon acetyl unit from pyruvate oxidation into the citric acid cycle. A describes nucleic acids, B describes ATP synthase, C describes hemoglobin, and D describes phospholipids, none of which is CoA's role. Carrying and transferring acyl groups such as acetyl is coenzyme A's central function.
A student adds a catalyst to a reaction mixture. Which thermodynamic and kinetic parameters are immediately affected?
Answer: C. Catalysts lower activation energy by stabilizing the transition state, increasing reaction rate. They do not alter ΞGΒ° and therefore do not change equilibrium position. This distinction is central to catalytic function.
In a DNA double helix, the two strands are described as 'antiparallel.' What does this mean?
Answer: E. 'Antiparallel' means the two strands of the double helix run in opposite directions: one is oriented 5'β3' while its complementary partner runs 3'β5'. A is wrong because the strands are complementary, not identical, and B has both strands parallel, which they are not. C misstates the bonding (the strands are held together by hydrogen bonds, not covalent bonds), and D contradicts the need to break hydrogen bonds to separate them; opposite 5'/3' orientation is what antiparallel means.
How important is biochemistry on the MCAT?expand_more
Biochemistry is one of the most heavily tested subjects on the MCAT, appearing in both the biology/biochemistry and the chemistry/physics sections. It is tested in an applied, experiment-based way, so a strong conceptual foundation benefits performance across much of the exam.
What are the high-yield MCAT biochemistry topics?expand_more
Prioritize amino acids and protein structure, enzymes (mechanisms, Michaelis-Menten kinetics, and inhibition types), and core metabolism (glycolysis, the citric acid cycle, and oxidative phosphorylation) along with their regulation, plus carbohydrate, lipid, and nucleotide fundamentals and common lab techniques.
How should I study biochemistry for the MCAT?expand_more
Study actively: build understanding of pathways and enzyme logic first, reinforce facts like amino acid properties with spaced repetition, and do many practice passages (especially AAMC) to train data interpretation. The MCAT applies biochemistry through experiments, so passage practice is essential.
Why do students struggle with MCAT biochemistry?expand_more
Common pitfalls include memorizing pathways without understanding their regulation, neglecting amino acids and enzyme kinetics, and under-practicing passages. Because the MCAT presents biochemistry through experiments and figures, practicing that format is as important as knowing the content.
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