Free Interview Resources
Free practice questions, preparation advice, and expert insights for Medical Biosciences interviews at Imperial College London.
Real Medical Biosciences interview questions in the style Imperial College London asks. Try answering each one aloud before you reveal the hint.
A candidate drug lowers tumour growth in a mouse xenograft by 40% versus vehicle, but the error bars for the two groups overlap substantially. Walk me through how you would decide whether this result is real.
Data & Problem-Solving
Hint
Distinguish effect size from statistical significance: ask about sample size, the actual p-value or confidence interval, biological versus technical replicates, and whether the overlap of error bars reflects SEM or SD.
You are given a survival curve comparing patients on a new immunotherapy against standard care. The curves separate at 18 months but cross at 6 months. What might explain the early crossing, and what does it tell you about the drug?
Data & Problem-Solving
Hint
Consider early toxicity or a delayed onset of immune-mediated benefit; mention that a hazard ratio assuming proportional hazards may be misleading here, and that median survival alone hides the shape.
A gene is expressed at twice the mRNA level in cancer tissue versus healthy tissue, yet the protein it encodes is undetectable in the tumour. Suggest three biological explanations.
Data & Problem-Solving
Hint
Think post-transcriptional and post-translational control: microRNA repression, blocked translation, rapid protein degradation, or a nonsense mutation producing unstable protein. Reward candidates who separate transcription from steady-state protein levels.
In a bacterial culture exposed to a fixed antibiotic dose, the population initially crashes, then rebounds to its original density within 48 hours. Using a simple growth model, reason about whether this is resistance or tolerance.
Data & Problem-Solving
Hint
Resistance raises the MIC (the survivors grow at the same dose); tolerance or persistence lets cells survive without dividing then resume. Ask them to propose an experiment, e.g. re-testing the MIC of the rebound population.
Explain to me how a single point mutation in a gene can, depending on where it falls, have no effect, a mild effect, or a lethal effect on the organism.
Conceptual & Mechanism
Hint
Cover synonymous versus missense versus nonsense changes, position within a functional domain or active site, splice sites and regulatory regions, and dominant versus recessive consequences.
Structured interviews that combine technical problem-solving with motivation and personal statement discussion.
Imperial interviews vary by department. Engineering and Computing tend to be technical with problem-solving elements. Medicine uses a Multiple Mini Interview (MMI) format with several short stations. Most interviews last 15-30 minutes and may include a presentation or group exercise.
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
The immune system must attack pathogens but not the body's own tissues. Explain the main mechanisms that enforce this distinction, and what happens when they fail.
midHint
Central tolerance in the thymus and bone marrow, peripheral tolerance via regulatory T cells and anergy, and the link to autoimmunity when these break down. Reward mention of self versus non-self and the danger/PAMP framing.
Cancer is often described as a disease of the genome. Explain what is meant by the hallmarks of cancer, and pick one hallmark to describe mechanistically.
midHint
Set out capabilities such as sustained proliferation, evading growth suppressors, resisting apoptosis, angiogenesis, and metastasis; then go deep on one, e.g. how loss of p53 lets damaged cells evade apoptosis.
A drug binds its receptor with very high affinity but produces almost no physiological response. Reconcile these two facts.
hardHint
Introduce the distinction between affinity and efficacy: the compound may be an antagonist or a partial agonist. Bring in receptor occupancy versus downstream signalling and the idea of spare receptors.
Why does antimicrobial resistance spread so much faster within a bacterial population than a comparable adaptation would spread through a population of mammals?
midHint
Short generation times, enormous population sizes, and crucially horizontal gene transfer via plasmids, transposons and conjugation, rather than only vertical inheritance. Contrast with sexual reproduction and slow generations in mammals.
Your statement talks about wanting to work in biomedical research rather than becoming a doctor. What is it about the science itself, as opposed to treating patients, that draws you in?
entryHint
This probes whether the applicant genuinely wants Medical Biosciences and not Medicine. A strong answer names a specific mechanistic or research question they find compelling and shows curiosity about the how, not just the helping.
You mention reading about a particular disease or piece of research. Tell me one thing in that reading you found genuinely surprising, and one thing you still do not understand about it.
midHint
Rewards honest intellectual engagement over rehearsed summary. The unresolved question shows the applicant is reading actively and knows the edges of their own understanding.
Imperial's course is built around an extensive laboratory programme and a final-year research project. What draws you specifically to hands-on experimental work, and where might you struggle with it?
entryHint
Look for authentic reflection on lab or project experience and self-awareness. A candid weakness, such as patience with troubleshooting or comfort with failed experiments, is more convincing than claiming to be a natural.
You listed a book on your statement. If you had to argue against one of its central claims, what argument would you make?
hardHint
Tests whether the applicant read critically rather than passively. They should be able to identify a weak point, an overstated conclusion, or missing evidence in a source they chose to cite.
Roughly how many cells are in the human body, and how would you go about estimating it from scratch?
midHint
A Fermi-style estimate. Reward a structured approach, for example body mass, typical cell mass or volume, and adjusting for the fact that most cells by number are small red blood cells and gut bacteria. The reasoning matters more than the figure.
If you could sequence the complete genome of any one extinct organism, which would you choose and what biomedical question would you hope it answered?
midHint
Look for a justified choice linked to a real research angle, such as immune-gene diversity in an extinct human relative or resistance genes in ancient bacteria, rather than a novelty answer.
A virus infecting humans mutates far faster than we do. Given that, why have we not been wiped out by any single pathogen?
hardHint
Bring in the adaptive immune system's ability to generate diversity within a lifetime, herd effects, trade-offs between virulence and transmission, and host population structure. Reward candidates who reframe evolution as an arms race rather than a race we lose.
Gene-editing embryos to remove a disease-causing mutation is now technically feasible. Should it be permitted? Argue the case, then argue the opposite.
hardHint
Reward candidates who separate somatic from germline editing, weigh preventing suffering against consent of future generations and off-target risk, and can genuinely hold both sides rather than only their preferred view.
A clinical trial shows a new drug works, but the pharmaceutical company funded the study and chose not to publish two earlier trials that showed no effect. Why does this matter scientifically, and what should be done about it?
midHint
Publication bias distorts the evidence base and meta-analyses; connect to trial pre-registration and mandatory results reporting. Rewards awareness of how the integrity of the literature underpins medicine.
There is a limited supply of a new antibiotic that still works against a highly resistant infection. Should it be reserved for the sickest patients, or restricted to preserve its usefulness for future ones? How would you decide?
hardHint
Balances individual benefit against antimicrobial stewardship and future populations. Look for the applicant recognising this as a genuine tension with no clean answer, and proposing who should decide and on what basis.
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Primary source for course structure, entry requirements and application details.