Imagine the cell is a factory. Each organelle has a job — match each one to its factory role:
| Organelle | Factory Role | What It Actually Does |
|---|---|---|
| Nucleus | 🏢 Boss's office | Contains DNA — controls all cell activities |
| Cell membrane | 🚧 Security gate | Controls what enters and leaves the cell |
| Cytoplasm | 🏭 Factory floor | Where most chemical reactions take place |
| Mitochondria | ⚡ Power station | Site of aerobic respiration — transfers energy |
| Ribosomes | 🔧 Assembly line | Where proteins are made (protein synthesis) |
Plant-Only Extras: "WCV" — Wall, Chloroplast, Vacuole
- Cell wall = outer fence (rigid cellulose — supports and protects)
- Chloroplast = solar panels (absorbs light for photosynthesis)
- Permanent vacuole = storage warehouse (filled with cell sap — keeps plant rigid)
Quick Trick for Exams
If asked "Which organelle...?" — mitochondria is almost always the answer when the question mentions energy, active cells, or respiration. Ribosomes is the answer when the question mentions protein or growth.
This memory aid covers Memory Aid: The Cell as a Factory within Cell Organelles for GCSE Biology. Revise Cell Organelles in Cell Biology for GCSE Biology with 12 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 10 of 14 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Practice questions for Cell Organelles
Scientists studying mitochondria use electron microscopes rather than light microscopes. Which statement correctly explains why electron microscopes are more useful for studying cell ultrastructure?
The diameter of a ribosome is approximately 0.00002 mm. (a) Write this diameter in standard form, in millimetres. (b) Convert this diameter into nanometres (nm).