Subjects
Biology practice, free.
Human physiology, genetics and cell biology, plants and ecology, with an explanation for every question and timed tests like the real exam.
- 192questions
- 5topics
- 3exams covered
- Freeno plans or paywalls
Biology in the United States
Practise biology with the exams you can take in the United States.
Where do you want to start?
- 110 questions · 2 topicsGenetics and cell biologyThe cell, inheritance and the molecules that carry information.Cell Biology, Genetics and Physiology · Biochemistry and Molecular Biology
- 56 questions · 2 topicsHuman biology and healthHow the human body works, how it reproduces and what makes it ill.Microbiology and Immunology · Microbiology and Infectious Disease
- 26 questions · 1 topicsPlants, ecology and diversityHow plants work, how living things are grouped, and how they live together.Cells, Genetics, Evolution and Ecology
The most practised topics.
Each topic has its own list of questions with explanations. Pick the exam you are preparing for.
Cell Biology, Genetics and Physiology
69 questions across 1 exam
Biochemistry and Molecular Biology
41 questions across 1 exam
Microbiology and Immunology
34 questions across 1 exam
Cells, Genetics, Evolution and Ecology
26 questions across 1 exam
Microbiology and Infectious Disease
22 questions across 1 exam
Real questions, worked answers.
- Cell Biology, Genetics and Physiology · MCAT (Medical College Admission Test)Which organelle contains hydrolytic enzymes for intracellular digestion?See the answer and explanation →
- Biochemistry and Molecular Biology · MCAT (Medical College Admission Test)Which amino acid has no stereocenter and is therefore achiral?See the answer and explanation →
- Microbiology and Immunology · USMLE Step 1A 30-year-old woman has dysuria. Urinalysis shows nitrites and leukocyte esterase. Which organism is most common?See the answer and explanation →
Practise it for real.
Biology in your exam.
How to practise biology.
- 1
Learn diagrams by drawing them
Sketch the cell, the heart or the nephron from memory, then check. Drawing fixes the labels better than reading.
- 2
Link structure to function
For every part, ask what it looks like and why that suits its job. It turns lists into reasons.
- 3
Say it in one sentence
After each chapter, write one sentence for each process. If you cannot, that is the part to revise.
- 4
Watch the exact words
Many wrong options differ from the right one by a single word, such as 'always', 'only' or 'all'.
- 5
Redo your mistakes after a week
Repeat the questions you got wrong after a few days. That is when a fact either sticks or fades.
Questions, answered.
- Is the biology practice really free?
- Yes. Every question, explanation, mock test and flashcard deck is free, with no plans or paywalls.
- Which exams does it cover?
- Biology questions from MCAT (Medical College Admission Test), USMLE Step 1, AP (Advanced Placement). There are 192 biology questions on this page's list today.
- Does every question have an explanation?
- Yes. Each question has an explanation with the working or the key idea, and you can open any question on its own page.
- Can I take a timed test?
- Yes. The mock tests below run on a real timer and show a full review with explanations at the end.