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Science · Biology

Cell Biology

Structure and function of the cell — organelles, membrane transport, and the difference between plant and animal cells. The exam rewards knowing not just what each organelle is called, but what job it actually does. Every question comes with a written explanation of the underlying function.

Practise cell biology nowSee sample questions
3
Difficulty tiers
25s
Target pace
60%
Average first-attempt score

What's covered

  • Organelle structure and function — match each organelle — nucleus, mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus — to the specific job it performs in the cell.
  • Plant vs. animal cells — identify the three structures unique to plant cells — cell wall, chloroplasts, and a large central vacuole — that animal cells lack.
  • Membrane transport — distinguish passive transport (diffusion, osmosis) from active transport, which requires energy to move substances against a concentration gradient.
  • Prokaryotic vs. eukaryotic cells — recognize that prokaryotic cells lack a membrane-bound nucleus and most organelles, while eukaryotic cells have both.
  • Cell theory — apply the core principles: all living things are made of cells, the cell is the basic unit of life, and all cells come from pre-existing cells.

Where students lose marks

Confusing mitochondria and chloroplasts

Mitochondria produce usable energy (ATP) from food in nearly every cell; chloroplasts capture light energy to produce food, and only exist in plant and some protist cells — mixing up which organelle does which job is one of the most common errors on this subtopic.

Mistaking osmosis for a general term for diffusion

Osmosis is specifically the diffusion of water across a semipermeable membrane — using it as a catch-all for any substance moving down its concentration gradient misses what makes it distinct.

Assuming all cells have every organelle

Red blood cells lack a nucleus, and prokaryotic cells lack membrane-bound organelles entirely — a question describing an unusual cell is testing whether that exception is known, not testing a typo.

Three sample questions

Straight from the bank — one per difficulty tier. Reveal the answer to see the explanation you'd get in a real session.

Sample 01Foundation

Which organelle is primarily responsible for producing the cell's usable energy?

Sample 02Core

A cell is placed in a solution with a much higher solute concentration than the fluid inside the cell. What will most likely happen to the cell?

Sample 03Advanced

A cell biologist observes that a particular molecule moves into a cell against its concentration gradient, and the process stops when the cell's ATP supply is depleted. Which transport mechanism is most likely responsible?

How to practise this

Cell biology questions reward matching structure to function precisely — a lot of wrong answers come from knowing the vocabulary but pairing it with the wrong job.

Pair every organelle with its one-sentence job

For each organelle, state its function in a single sentence before moving to the next question. Untimed practice is where those pairings get locked in.

Then 25 seconds a question

Move to timed sessions once organelle-function pairs are instant recall. These should be some of the faster Biology questions once the vocabulary is solid.

Fold into a mock

Pair cell biology with genetics in a mock — both build on the same cell-level foundation before scaling up to organisms.

Stop mixing up the organelles.
Start pairing structure to function.

  • A function-by-function walkthrough on every item
  • Timed or untimed sessions, any length you like
  • Tracked separately — see your cell biology accuracy and pace over time
Start practising free

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