Loading…
Especially relevant to University of Oxford and University of Cambridge.
Say your answer out loud first, then jot down the key points you made. Writing it helps you spot gaps — and it's what the AI feedback reads.
0 words
Ability to handle a question with no single correct answer: defining terms, testing definitions against cases, and reaching a reasoned position.
A structure to build your own answer on — not a script.
Define
The answer depends on the definition of life — e.g. the characteristics listed at school (movement, respiration, sensitivity, growth, reproduction, excretion, nutrition), or 'a self-sustaining system capable of evolution'.
Test against viruses
Viruses have genetic material and evolve, but no metabolism and can only replicate inside host cells.
Test the definition with other cases
Red blood cells don't reproduce; seeds are dormant; obligate intracellular bacteria also depend on hosts.
Conclude
Borderline; 'alive' may be a spectrum rather than binary; the definition is a human tool.
A strong but not perfect answer. Read the notes to see why it works — then make your own version with your experiences.
I think it depends on how we define 'alive'1, so I'd start there.
At school we learn characteristics like movement, respiration, growth, reproduction and so on. By that list, viruses mostly fail: outside a cell, a virus particle doesn't metabolise, grow or respond to anything — it's closer to a complex chemical. But once it's inside a host cell, it takes over the cell's machinery and makes thousands of copies of itself, and viruses carry genetic information and evolve by natural selection, which seems very life-like.
The trouble is that when I test the definition on other things, it wobbles2. A red blood cell can't reproduce, but we'd say it's alive. A seed can be dormant for years with barely any metabolism. And some bacteria can only reproduce inside host cells too, yet we call them alive. So 'depends on a host' can't be the only dividing line.
If we use a definition like 'a system capable of evolution by natural selection', viruses would count. If we require independent metabolism, they don't.
My view is that viruses sit on the boundary, and that tells us something: 'alive' might be more of a spectrum than a yes/no category3. The definition is a tool we invented, and viruses show its limits. For medicine, what matters more is understanding how they replicate — that's what we target with antivirals and vaccines.
Real interviews are won and lost here. Answer each one aloud.