Exam preparation
MCAT
- Multiple choice
- United States
- Medicine
- Association of American Medical Colleges (AAMC)
2 guides for this exam — how to prepare, what to practise, and how to know it has gone in.
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A practice question
Choose an answer and it is marked, with the explanation. From MCAT Practice Questions: Passage-Based Worked Practice.
Researchers place identical red blood cells in solutions with different sodium chloride concentrations. Cells placed in 0.20% NaCl swell and some lyse, whereas cells placed in 0.90% NaCl retain their shape. Which statement best identifies the independent variable in this experiment?
The sodium chloride concentration is selected by the researchers, so it is the independent variable. Lysis, cell volume and haemoglobin release are measured responses. The strongest distractor is the proportion of cells that lyse: it changes between groups, but it is the dependent variable rather than the variable manipulated by the researchers.
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Guides
- MCAT Study Plan: An 8-Week Method That WorksUse this practical 8-week MCAT study plan to schedule passage practice, review, error analysis and spaced repetition across all four sections.
- MCAT Practice Questions: Passage-Based Worked PracticeWork through 10 MCAT practice questions covering science reasoning, CARS, data interpretation, variables, units and answer elimination.
Preparing for MCAT? Build your MCAT board from your own notes — the cards, papers and lectures are written from it. Free plan: 20 cards, a paper, a lecture and a viva to try.
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