Free Interview Resources
Free practice questions, preparation advice, and expert insights for Biochemistry interviews at Oxford.
Real Biochemistry interview questions in the style Oxford asks. Try answering each one aloud before you reveal the hint.
Would you expect this compound to be more soluble in octanol or water?
Problem-Solving
Hint
Start by separating the functional groups, then compare the interactions each group could make with water and octanol.
Can you interpret this graph showing how the relative solubility of a compound in octanol versus aqueous solution varies with pH?
Problem-Solving
Hint
Look first at the plateau regions, then ask how protonation state and charge might change as pH changes.
How would you design a better insulin treatment for a diabetic patient?
Problem-Solving
Hint
Think about pharmacokinetics, delivery route, glucose sensing, feedback control and patient behaviour.
How do amino acids behave in acidic conditions? What about basic conditions?
Problem-Solving
Hint
Draw the amino acid backbone and track which groups are protonated or deprotonated as pH changes.
Given that a potassium-channel selectivity filter is lined with carbonyl oxygens, why might the channel allow potassium ions through but not sodium ions?
Problem-Solving
Hint
Compare ionic radius, dehydration cost and how carbonyl oxygens could substitute for water around the ion.
Tutorial-style interviews with subject-specific problems, often involving unfamiliar material.
Oxford interviews typically take place at the college you applied to. You will usually have two or three interviews of around 20-30 minutes each, sometimes at different colleges if you are pooled. The atmosphere is meant to resemble a tutorial: the interviewer gives you a problem and watches how you reason through it.
Interview Invitation
Late Nov
Arrival to Interview
Early Dec
Technical Question
Mid Dec
Decision
Early Jan
Interview Invitation
Late Nov
Arrival to Interview
Early Dec
Technical Question
Mid Dec
Decision
Early Jan
How does a perm work?
midHint
Think about protein structure in hair, disulfide bonds and how chemical treatment can break and reform them.
A nuclease cuts DNA at regular intervals because it attaches to a histone protein and cuts straight across the DNA. What pattern would you expect to see?
hardHint
Map the DNA packaging idea onto repeat units and predict fragment sizes rather than trying to recall a named experiment.
Draw an amino acid, then draw a second amino acid and show how the two form a peptide bond. Which atom in the peptide bond region is most electronegative?
entryHint
Draw the backbone carefully, form the amide linkage by loss of water, then compare electronegativity of atoms in the linkage.
If a codon had four bases instead of three, how would this change the structure of tRNA?
hardHint
Focus on codon-anticodon pairing and how the anticodon loop would need to recognise a longer information unit.
How many moles of water are in a single cup of water?
entryHint
Estimate the cup volume, convert to grams using water density, then divide by molar mass.
Why do some habitats support higher biodiversity than others?
midHint
Compare high-diversity habitats and ask whether diversity reflects higher speciation, lower extinction, or both.
Why do many animals have stripes?
entryHint
Generate examples first, then group possible functions such as camouflage, warning, mimicry or developmental patterning.
Is it easier for organisms to live in the sea or on land?
midHint
Define what 'easier' means before comparing salinity, support, desiccation, pressure and sensory demands.
Why do lions have manes?
entryHint
Offer more than one hypothesis and then describe what evidence would distinguish between them.
Why do human beings have two eyes?
entryHint
Consider depth perception, field of view, redundancy and how the nervous system integrates visual information.
Explain transcription and translation.
entryHint
Give the core flow of information first, then add enough molecular detail to show accuracy without over-talking.
Why do we need ATP rather than just releasing energy from glucose directly?
midHint
Compare controlled coupling of reactions with uncontrolled energy release, then think about regulation and cellular location.
What is it about Biochemistry that made you decide to study it?
entryHint
Link your motivation to molecular explanations of life rather than simply saying you like biology and chemistry.
Why have you chosen to apply to Oxford for Biochemistry (Molecular and Cellular)?
entryHint
Anchor the answer in tutorial-style discussion, the integrated master's structure and the fourth-year research project.
Are there any particular things you are looking forward to if you came to study Biochemistry at Oxford?
entryHint
Choose a course-specific feature and explain the intellectual reason it appeals to you.
Tell us about stem cell research.
midHint
Start from what you wrote or read, then distinguish scientific mechanisms from ethical or clinical implications.
Here is a cactus. Describe it in as much detail as possible and account for what you see.
entryHint
Separate observation from explanation: list visible structures first, then infer possible functions in a dry habitat.
Ladybirds are red. So are strawberries. Why?
midHint
Treat the same colour as potentially serving different functions in different organisms.
Why are all of the bonds around carbon in this compound apparently stable when carbon normally forms four bonds?
hardHint
Check the valence count and then consider whether delocalisation or resonance could explain an apparently unusual structure.
If you could save either the rainforests or the coral reefs, which would you choose?
midHint
Balance biodiversity, ecosystem services, human needs and long-term sustainability rather than searching for one correct answer.
If all the tigers in the world died, how long would it be before all the genes associated with tigers became extinct?
hardHint
Separate the death of individuals from the persistence of alleles in relatives, hybrids or stored biological material.
12+ weeks
8-12 weeks
4-6 weeks
1-2 weeks
the week of
Unlock the full guide
Free Resource
The Complete Oxford Biochemistry Interview Guide
Enter your email to unlock the full question bank, worked approaches, a week-by-week prep roadmap, and the mistakes that cost offers.
Practice with a Oxford Biochemistry graduate who's been through it.
Book Mock Interview →Watch & Learn
Official demonstration interview for Oxford Biochemistry preparation.
Course overview useful for understanding what applicants are applying to study.
Closely adjacent official STEM interview example for biological reasoning and discussion style.
Helps candidates prepare for online interviews requiring shared working or whiteboard-style technology.
College-level perspective on how Biochemistry interviews feel and how to prepare.
All videos are the property of their respective creators.
Further Reading
by Nick Lane
Department-recommended reading that connects molecular mechanisms with big biological questions.
by Richard Dawkins
Useful for thinking about molecular biology and evolution in an argument-driven way.
by Horace Freeland Judson
Provides historical context for the molecular-biology revolution and how discoveries were reasoned through.
by Bruce Alberts et al.
A substantial reference for motivated applicants who want clearer cellular and molecular foundations.
by Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr. and Lubert Stryer
A standard biochemistry textbook for selective reading on proteins, metabolism and molecular mechanisms.
by University of Oxford Department of Biochemistry
Gives department-level criteria, shortlisting information, interview format and reallocation/open-offer details.
by University of Oxford
Best source for the kind of unfamiliar, discussion-led prompts Oxford uses.
by Biochemical Society
Accessible overview of biochemistry areas and terminology for applicants beginning supercurricular exploration.
by University of Oxford
Official admissions context, useful for parents and applicants unfamiliar with Oxford processes.
by University of Oxford Department of Biochemistry
Shows the range of real research areas that can inform a motivated personal statement.