Free Biochemistry MCQs with Answers
393 free Biochemistry MCQs organised topic by topic, each with the correct answer and a written explanation of why that answer is correct. Unlimited attempts, no fee and no account needed.
Biochemistry is examined by 6 of the exams on TestUstad, NLE, USMLE Step 1, MO and FCPS Part 1 among them, and all of them draw the same bank. A Biochemistry fact does not change between papers, so one page prepares you for every exam that asks it.
Biomolecules, metabolism and molecular biology at MBBS level, with clinical correlations.
393
Free MCQs
8
Topics
6
Exams testing it
up to 15 MCQs a paper
393
With explanations
Biochemistry topic-wise MCQs
All 8 topics of Biochemistry, in syllabus order with the depth of the bank behind each one. Tap a topic to practise it on its own. If you are short of time, start with Vitamins and Minerals, Metabolism and Bioenergetics and Proteins and Amino Acids.
No solved Biochemistry papers have been counted yet, so the share column is each topic's share of the Biochemistry bank rather than of a real paper. It tells you where the practice material is deepest, which is not the same as where the marks are.
| Topic | MCQs | Share of bank | Priority |
|---|---|---|---|
| Carbohydrates | 28 | 7% | Standard |
| Lipids | 52 | 13% | Important |
| Proteins and Amino Acids | 55 | 14% | Critical |
| Enzymes | 36 | 9% | Standard |
| Vitamins and Minerals | 77 | 20% | Critical |
| Metabolism and Bioenergetics | 68 | 17% | Critical |
| Molecular Biology | 38 | 10% | Important |
| Clinical Biochemistry | 39 | 10% | Important |
Exams that test Biochemistry
Every exam on TestUstad that examines Biochemistry, and how much of each paper it is worth. The weightage is what decides how much of your preparation Biochemistry deserves: at 15 of 100 MCQs it is 15% of the NLE paper on its own.
Biochemistry in government job tests
| Exam | Biochemistry MCQs | Share of paper |
|---|---|---|
| MO Biochemistry MCQs Medical Officer Test. Conducted by Public Service Commissions. | 12 | 12% |
Biochemistry in licensing exams
| Exam | Biochemistry MCQs | Share of paper |
|---|---|---|
| NLE Biochemistry MCQs National Licensing Examination. Conducted by Pakistan Medical and Dental Council. | 15 | 15% |
| USMLE Step 1 Biochemistry MCQs USMLE Step 1. Conducted by NBME / FSMB (ECFMG for international graduates). | 13 | 13% |
| FCPS Part 1 Biochemistry MCQs FCPS Part 1. Conducted by College of Physicians and Surgeons Pakistan. | 10 | 10% |
| PLAB 1 Biochemistry MCQs PLAB 1. Conducted by General Medical Council (UK). | 5 | 5% |
| AMC MCQ Biochemistry MCQs AMC CAT MCQ Examination. Conducted by Australian Medical Council. | 5 | 5% |
How to prepare Biochemistry for your test
Work one topic at a time, not the whole subject. Reading Biochemistry end to end feels productive and is the slowest way to raise a score. Pick a single topic, solve its MCQs until you are consistently above 80 percent, and only then move on. There are 8 to get through.
Read the explanation on every question you get wrong. This is the whole reason to practise online rather than from an answer key. A wrong answer is only useful if it tells you which fact you were missing, so every Biochemistry MCQ here carries a written explanation and no question can be published without one.
Start where the marks are. Vitamins and Minerals, Metabolism and Bioenergetics and Proteins and Amino Acids carry the most Biochemistry material in the bank. A weak topic near the top of the table above costs you more marks than a weak one near the bottom, so the order you revise in matters as much as the hours you put in.
Finish with mixed, timed practice. Recalling a fact under the clock is a different skill from recognising it while you revise, and it is the one the paper actually tests. Once several topics feel solid, sit a timed test that mixes them rather than practising one topic at a time.
What is in the Biochemistry question bank
393 published Biochemistry MCQs, every one of them carrying the correct answer and a written explanation.
Biochemistry preparation by exam
Each exam hub adds the things that are true of that paper alone: its pattern, its subject weightage, its solved past papers and a study plan built around its date.
Biochemistry MCQs: frequently asked questions
Are these Biochemistry MCQs free?
Yes. Every Biochemistry MCQ on TestUstad is free to read and practise, with unlimited attempts, no daily limit and no account required. There is no trial that expires and no paywall on the question bank. Only full-length mock tests and long-term progress tracking are paid.
Do the Biochemistry MCQs come with answers and explanations?
Yes. Every Biochemistry question shows the correct answer and a written explanation of why that option is correct, not just an answer key letter. A question cannot be published on TestUstad without an explanation.
How many Biochemistry MCQs are there?
There are 393 published Biochemistry MCQs on TestUstad, organised across 8 chapters. All of them are free, and new questions are added regularly.
Are the Biochemistry MCQs chapter-wise?
Yes. The Biochemistry MCQs are split into 8 chapters so you can practise one chapter at a time instead of working through the whole subject. You can also practise every Biochemistry question together from the "All MCQs" page.
Which exams do these Biochemistry MCQs help with?
The same Biochemistry bank is used for every exam that tests Biochemistry, including NLE, USMLE Step 1, MO, FCPS Part 1, PLAB 1, AMC MCQ. A Biochemistry question does not change between exams, so practising here prepares you for all of them at once.
Are these Biochemistry MCQs only for NLE?
No. NLE is the paper that carries the most Biochemistry, at 15 of its 100 MCQs, but the same Biochemistry bank is drawn by every other exam that examines the subject, including USMLE Step 1, MO, FCPS Part 1, PLAB 1, AMC MCQ. Nothing here is written for one paper: a Biochemistry fact is the same fact whichever exam asks it, so you can prepare for all of them from this one page.
Which Biochemistry chapters are most important?
Vitamins and Minerals, Metabolism and Bioenergetics, Proteins and Amino Acids, Lipids, Clinical Biochemistry carry the most Biochemistry questions in the TestUstad bank. No solved Biochemistry papers have been counted yet, so treat that as a guide to where the practice material is deepest rather than as a measured paper ranking.
How should I prepare Biochemistry for a test?
Work one chapter at a time rather than reading the whole subject end to end. Solve that chapter's MCQs until you are consistently above 80 percent, read the explanation on every question you get wrong, and move on only then. There are 8 Biochemistry chapters to get through. Once several chapters feel solid, sit a timed test that mixes them, because recalling a fact under the clock is a different skill from recognising it while you revise.
Do I need to sign up to practise Biochemistry MCQs?
No. You can practise Biochemistry MCQs on TestUstad without creating an account, without giving an email address and without a card. An account only saves your history and progress across sessions.