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MCAT Biology Questions
Practise biology (science) for the Medical College Admission Test: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Biology practice
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Q1.Which part of the flower develops into the fruit?
Show answer & explanation
Answer: D — Ovary
After fertilisation the ovary develops into the fruit.
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Q2.The process by which cells divide to form gametes is:
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Answer: D — Meiosis
Meiosis halves the chromosome number to form gametes.
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Q3.DNA is mainly found in the cell’s:
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Answer: B — Nucleus
Most DNA is in the nucleus (some in mitochondria and chloroplasts).
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Q4.Normal human body temperature is approximately:
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Answer: B — 37 °C
About 37 °C (98.6 °F).
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Q5.Who proposed the theory of evolution by natural selection?
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Answer: D — Charles Darwin
Darwin (with Wallace) proposed natural selection; ‘On the Origin of Species’ was published in 1859.
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Q6.Which vitamin deficiency causes scurvy?
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Answer: D — Vitamin C
Scurvy results from a lack of vitamin C (ascorbic acid).
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Q7.Gas exchange in the lungs takes place in the:
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Answer: B — Alveoli
Thin-walled alveoli allow oxygen and CO₂ to diffuse.
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Q8.Which disease is caused by a deficiency of iodine?
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Answer: B — Goitre
Iodine deficiency causes goitre (thyroid enlargement).
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Q9.Bile is produced by the:
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Answer: D — Liver
Bile is made in the liver and stored in the gall bladder.
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Q10.Which organelle synthesises proteins?
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Answer: D — Ribosome
Ribosomes translate mRNA into protein.
How to approach biology questions
Learn structure → function links (mitochondria → ATP, nephron → filtration), the major hormones and their glands, and deficiency diseases. Diagrams help with cell organelles and organ systems.
About MCAT
Medical College Admission Test — conducted by Association of American Medical Colleges (AAMC). Medical school admission test covering biological, chemical, physical, psychological and social foundations.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
MCAT practice topics
| Topic | Section | Question source |
|---|---|---|
| Biology | Science | Question bank |
| Chemistry | Science | Calculated + question bank |
| Physics | Science | Calculated + question bank |