What you actually apply for at each university, and the single question Oxford publishes with its own marking notes
Book a Free ConsultationCambridge does not offer an undergraduate Biochemistry degree. Biochemistry is one of 14 departments inside Natural Sciences, and Year 3 is the first point at which a Cambridge student specialises in it — so a “Cambridge biochemistry interview” is a Natural Sciences interview. Oxford is the opposite: Biochemistry (Molecular and Cellular) is a standalone four-year course, UCAS code C700, and for 2027 entry it requires no admissions test and no written work at all.
Preparing for a biochemistry interview this December? Our Biochemistry expert pack (£180) works through interview questions of exactly this kind with model answers and technique notes from specialist subject tutors. Medicine applicants meeting biochemistry at interview want the Biochemistry for Medics pack instead.
See the free chemistry sample Or book a free consultationNo, and this is the first thing to get right, because it changes what you apply for and what you are asked. Cambridge’s Natural Sciences course page describes the course as giving you “the opportunity to study physical and biological sciences from 14 different departments”, and Biochemistry is one of the fourteen it lists, alongside Chemistry, Genetics, Pathology, Pharmacology and Physiology, Development and Neuroscience.
| Year | What a Cambridge biochemist is actually doing |
|---|---|
| Year 1 (Part IA) | Three science subjects chosen from the Part IA options |
| Year 2 (Part IB) | Three courses — the biochemistry-facing ones include Cells to Organisms and Chemistry B (organic, inorganic and biological chemistry) |
| Year 3 (Part II) | The first year you can specialise in Biochemistry, one of 15 Part II options |
| Year 4 (Part III) | Optional MSci in Biochemistry; progression normally needs at least a 2.i in Year 3 |
Read down that table and the shape of the decision becomes clear. Nothing in the first two years commits you to biochemistry, and Cambridge says so explicitly: “You can change your mind about which subject to specialise in as you progress through the course.” The corollary is that no one is interviewing you for a biochemistry place, because no such place exists at the point of application. They are deciding whether you can do Natural Sciences.
That is genuinely an advantage for a candidate who is not certain. It is a disadvantage for one who is: the first two years go on a broad science course before the subject you came for becomes the subject you study, and some Part II subjects, Cambridge notes, have limited numbers because of laboratory space.
You apply to Natural Sciences at a College, and you declare a stream. Cambridge asks applicants to say whether they are interested in Biological or Physical Sciences, and is unusually direct about the consequence: “Your choice of application stream, and the courses that you are currently studying, will affect the types of questions that are asked at interview.”
Its own advice on how to choose is worth quoting in full, because it is more practical than most guidance on the subject: “It is best to apply for Physical Sciences if you have studied Physics and Maths A levels. This is because your interview will be on subjects that you have already studied.” A prospective biochemist carrying Biology, Chemistry and Maths applies Biological, and should expect the interview to run on the biology and chemistry they already know rather than on biochemistry they have not met.
The requirements are demanding and specific. The minimum offer for 2027 entry is A*A*A at A level, or 41–42 IB points with 776 at Higher Level. Subject-wise, Cambridge requires Mathematics plus two other science or maths subjects — Biology, Chemistry, Physics, and, for A level only, Further Mathematics. Every applicant must also sit the ESAT: “All applicants for Natural Sciences are required to take the Engineering and Science Admissions Test (ESAT) at an authorised assessment centre.” Written work is not usually requested.
Cambridge applicants have an ESAT to sit first — booking closes 6pm on 28 September 2026 and there is no second sitting. Our specialist tutors cover both halves: timed ESAT work before 12–16 October, then biochemistry interview practice once results land on 16 November.
Book a Free Consultation Message us on WhatsAppAlmost every candidate searching for biochemistry interview questions is applying to one of these two universities and assuming the applications are broadly alike. They are not alike in any respect that matters.
| Oxford | Cambridge | |
|---|---|---|
| What you apply for | Biochemistry (Molecular and Cellular), UCAS C700 | Natural Sciences — Biochemistry is a Year 3 option |
| Length | 4 years | 3 years, optional 4th |
| Minimum offer | A*AA | A*A*A (IB 41–42, with 776 at Higher Level) |
| Subjects required | Chemistry, plus another science or Maths | Mathematics, plus two other science or maths subjects |
| Maths A level | Recommended, not required | Required |
| Admissions test | None | ESAT, booked by 28 September 2026 |
| Written work | None | Not usually requested |
| Interview | At least one, online, December 2026 | Main period 7–18 December 2026 |
Two rows in that table decide things. The first is Maths. Cambridge requires it; Oxford does not, saying only that Mathematics “is recommended to students in completing the course and, although not required for admission, may make an application more competitive.” A candidate taking Biology, Chemistry and a non-science third subject can apply to Oxford Biochemistry and cannot apply to Cambridge Natural Sciences at all. That is not a preference; it is a door that is open or shut.
The second is the test. A Cambridge applicant has a hard administrative deadline in September: ESAT booking for the October 2026 sitting closes at 6pm UK time on 28 September 2026, tests run 12–16 October and results reach candidates on 16 November. An Oxford Biochemistry applicant has no required assessment at all between the 15 October UCAS deadline and a December interview. If you are applying to both, you are running two timetables at once, and only one of them can be missed by accident.
Most question lists for this subject are remembered, unattributed and old. Oxford publishes one Biochemistry question itself, on its sample interview questions page, with the interviewer named and her own account of what it is for. It is more useful than any of them.
The interviewer is Kathryn Scott, of Christ Church, and the question is: “Would you expect this compound to be more soluble in octanol or water?” The candidate is shown the structure of an organic compound carrying functional groups they will know from A-level or IB.
What Oxford says next is the part worth reading twice. “We do not expect the student to know the answer to this question straight away, and in fact getting the correct answer isn’t important here. It is more useful for us to see how the candidate applies their chemical knowledge to a problem they are unlikely to have considered before, how they justify their conclusions and whether they are capable of considering alternative possibilities.”
It also describes what happens when a candidate stalls, which is the thing applicants most fear and least understand: “If a student struggles with a starting point we would prompt them to describe more generally the different kinds of interactions that hold molecules together and to comment on their relative strength.” The prompt is not a rescue and it is not a mark against you. It is how the conversation is designed to work.
Oxford then gives the method it considers good: “first consider the individual functional groups separately and then to discuss the compound as a whole.” And there is a second part. The relative solubility of a compound in octanol against aqueous solution varies with pH, and the candidate is shown that relationship as a graph and asked to interpret it. Oxford notes it is “careful at this point to make sure that the student has understood the explanation before moving forward” — the extension introduces new information deliberately, to see what you do with it.
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Oxford Biochemistry has no admissions test and asks for no written work. Everything before the interview is therefore predicted grades, GCSEs and a personal statement, and everything after it is the interview. The published admissions statistics show what that produces.
| Oxford Biochemistry (Molecular and Cellular) | Three-year average, 2023–25 |
|---|---|
| Applicants interviewed | 41% |
| Applicants successful | 12% |
| Intake | 100 |
| Pre-interview test | None |
| Written work | None |
Over the three years 2023–25, Oxford interviewed 41% of Biochemistry applicants and made offers to 12%, against an average intake of 100. Those two figures describe two separate filters. Roughly three in five applicants never reach an interview, and they are cut on paper alone, because there is nothing else to cut them on. Of the 41% who do reach an interview, a little under a third end up with an offer — so the interview is where the majority of the remaining decision is made.
Cambridge distributes the same decision differently. The ESAT sits between the application and the shortlist, so a Natural Sciences candidate has already been measured on timed problem-solving before anyone speaks to them. Neither arrangement is easier. But they reward different preparation, and a candidate applying to both should not prepare for them as one thing. If you want the full picture of what changed at Oxford for this cycle, we set it out in what replaced what in Oxford’s admissions tests.
Reasoning aloud from A-level chemistry to a problem you have never seen is a skill, not a fact you can revise. The Biochemistry expert pack (£180) is built around that: worked model answers written by specialist subject tutors as transcripts of reasoning, so you can see where a strong candidate hesitates and what they say next. Our tutors then run the same questions as mock interviews, with the interruptions a real interviewer uses.
Biochemistry expert pack £180 Or book a free consultationTake the published question seriously as a specification. It is A-level chemistry applied to something you have not seen, answered out loud, with prompts. That tells you three things about preparation, and none of them is “learn more biochemistry”.
First, the raw material is your existing syllabus. Functional groups, intermolecular forces, relative bond strengths, acid–base behaviour: the question above is built entirely from A-level chemistry, and the difficulty is the novelty of the application rather than the content. Second, the reasoning has to be audible. An interviewer who cannot hear your reasoning cannot prompt it, and prompting is how the question is meant to run. Third, you need practice being interrupted mid-thought, because that is the actual format and it is nothing like a written paper.
For the Cambridge route there is a fourth thing, and it comes first in time: the ESAT. Booking closes on 28 September 2026 and there is no second sitting for undergraduate applicants, so that deadline governs the autumn. Our Cambridge Natural Sciences interview guide and our Natural Sciences interview page both cover the stream-specific side of that interview in more detail.
For worked material, our Oxbridge interview questions hub carries Oxford’s own published questions by subject alongside our full packs, 30 of them at £180 each. Two are relevant here and they are not interchangeable: the Biochemistry pack is written for Natural Sciences and Oxford Biochemistry applicants, and the Biochemistry for Medics pack is written for Medicine applicants who meet biochemistry at interview. Nine subjects have a free sample; the closest to this material are the chemistry sample and the biology sample, either of which shows the format before you decide on a pack.
Not as an undergraduate application. Cambridge lists Biochemistry as one of 14 departments inside Natural Sciences, and Year 3 (Part II) is the first point at which you can specialise in it. You apply to Natural Sciences, declare a Biological or Physical stream, and are interviewed on Natural Sciences rather than on biochemistry specifically. Oxford is the opposite: Biochemistry (Molecular and Cellular) is a standalone four-year course with its own UCAS code, C700.
No. Oxford’s course page states that you do not need to take a written test as part of an application for this course, and that you do not need to submit any written work either. That makes the interview and the UCAS application the entire assessment. Cambridge is different: every Natural Sciences applicant must sit the ESAT at an authorised centre, and booking for the October 2026 sitting closes at 6pm UK time on 28 September 2026.
Oxford publishes a sample question from Kathryn Scott at Christ Church: “Would you expect this compound to be more soluble in octanol or water?” The candidate is shown an organic compound with functional groups familiar from A-level or IB. Oxford states directly that getting the correct answer is not important; what it assesses is how a candidate applies chemical knowledge to an unfamiliar problem, justifies conclusions and considers alternatives. There is a second part asking you to interpret a graph of solubility against pH.
For Cambridge, yes. Natural Sciences requires Mathematics plus two other science or maths subjects at A level or IB Higher Level. Oxford Biochemistry does not require it: the requirement is Chemistry plus another science or Mathematics, and Oxford says only that Maths “is recommended to students in completing the course and, although not required for admission, may make an application more competitive.” That single difference decides which of the two is even open to some candidates.
Cambridge asks you to declare one on the application and says the choice matters at interview: “Your choice of application stream, and the courses that you are currently studying, will affect the types of questions that are asked at interview.” Its own guidance adds that it is best to apply for Physical Sciences if you have studied Physics and Maths A levels, because the interview will then be on subjects you have already studied. A prospective biochemist with Biology and Chemistry normally applies Biological.
Over the three years 2023–25, Oxford interviewed 41% of Biochemistry applicants, 12% were successful, and the intake averaged 100 places. Read alongside the absence of any test or written work, those numbers say something specific: roughly three in five applicants are filtered out on predicted grades and the UCAS form alone, and of those who reach an interview, a little under a third receive an offer.
Our specialist tutors run mock interviews in the shape the question above describes — an unfamiliar problem built on A-level chemistry, with prompts when a candidate stalls rather than a move to the next question. For Cambridge applicants we also cover the ESAT before the 12–16 October sitting. Our Biochemistry expert pack (£180) carries worked model answers written as transcripts of reasoning, and there is a free chemistry sample on the hub if you want to see the format first.
Oxford states that shortlisted candidates are invited to at least one online interview, expected to take place in December 2026. Cambridge’s main interview period for 2027 entry runs from 7 December to 18 December 2026, with most invitations sent in November, and it also runs a winter pool round in mid to late January 2027. Cambridge adds that it cannot reschedule interviews except in exceptional circumstances, so the period has to be kept free.
Free samples in nine subjects show you the format, the full expert packs are £180 each, and 1-to-1 mock interviews put either of them under interview conditions.
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