Section guide · B/B
MCAT Bio/Biochem (B/B)
Mostly biology, with a large share of biochemistry. Passages are research summaries, so the section rewards knowing core pathways well enough to reason about an experiment you have never seen.
Practice B/B free 59 questions · 95 min
How the section is built
Ten passages with 4–7 questions each, plus 15 standalone questions. Expect experiment descriptions with figures: knockouts, inhibitors, gels and dose-response curves.
What it tests
- Predict the effect of a mutation or inhibitor on a pathway
- Interpret gels, blots and enzyme kinetics plots
- Connect organ-system physiology to molecular mechanisms
- Spot the variable an experiment actually tests
How to practice it
- Know the high-yield pathways (glycolysis, TCA, ETC, signaling) cold
- Translate each figure into one sentence before reading the questions
- Ask what the control group is for every experiment
- Track recurring misses by system to plan content review
MCAT Bio/Biochem questions
How many questions are in MCAT Bio/Biochem?
59 questions in 95 minutes on the real exam, the same as our practice section.
How do I practice MCAT Bio/Biochem?
Take a timed section, then review every miss by type. Our free B/B section has 10 passages and explanations for every answer choice.
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