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Cells official content
Cells official content develops AQA A-Level Biology knowledge through Structure of eukaryotic cells, Structure of prokaryotic cells and viruses, Methods of studying cells, All cells arise from other cells, Transport across cell membranes, Cell recognition and the immune system. Students should connect molecular detail, cell-level mechanisms, organism-level outcomes and ecological or genetic consequences where relevant, rather than treating each objective as an isolated definition. The topic overview should help learners locate every learning objective, recognise the main command words and prepare for data-led questions. Focus on precise biological vocabulary, cause-and-effect chains, and evidence from practical work or experimental observations. Useful revision links include Describe, structure, eukaryotic, organelles., organelle, function, Distinguish, animal,, features, specified.. Strong answers should state the biological principle, apply it to the named context, interpret any data carefully and finish with a clear consequence or evaluation. Common mistakes include giving GCSE-level descriptions, missing the scale of organisation, or using a correct term without explaining why it matters in this A-Level context.
29
Objectives
10
Flashcards
10
Questions
90 min
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Syllabus checklist
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29 objective pages available
Structure of eukaryotic cells4 objectives
- Describe the structure of eukaryotic cells and their organelles.
- Relate organelle structure to function in eukaryotic cells.
- Distinguish animal, plant and fungal cell features where specified.
- Interpret cell structure diagrams and micrographs.
Structure of prokaryotic cells and viruses4 objectives
- Describe prokaryotic cell structure.
- Compare prokaryotic cells with eukaryotic cells.
- Describe virus structure using genetic material and protein coat features.
- Interpret diagrams of prokaryotic cells and viruses.
Methods of studying cells5 objectives
- Use magnification and resolution in cell-study contexts.
- Compare optical and electron microscopy evidence.
- Describe principles of cell fractionation and ultracentrifugation.
- Use and manipulate the magnification formula.
- Required practical 2: prepare stained plant root tip squashes, use an optical microscope to identify mitosis stages and calculate mitotic index.
All cells arise from other cells5 objectives
- Describe the cell cycle and mitosis in eukaryotic cells.
- Explain how binary fission produces new prokaryotic cells.
- Explain how uncontrolled cell division can produce tumours.
- Describe virus replication using host-cell machinery.
- Calculate and interpret mitotic index where relevant.
Transport across cell membranes5 objectives
- Relate cell-surface membrane structure to transport across membranes.
- Explain diffusion, facilitated diffusion, osmosis and active transport.
- Explain co-transport mechanisms in biological contexts.
- Required practical 3: use dilution series and calibration curve techniques to investigate plant tissue water potential.
- Required practical 4: investigate the effect of a named variable on cell-surface membrane permeability.
Cell recognition and the immune system6 objectives
- Explain cell recognition using antigens and cell-surface molecules.
- Describe phagocytosis and lymphocyte responses to pathogens.
- Explain antibody structure and antibody action.
- Explain vaccination and herd immunity principles.
- Evaluate monoclonal antibody uses and HIV effects on the immune system.
- Required practical 6: use aseptic techniques to investigate the effect of antimicrobial substances on microbial growth.
Key terms
Exam tips
- Use diagrams effectively: In exam answers, include labeled diagrams of eukaryotic cells to illustrate organelle functions.
- Use diagrams effectively: In questions about cell structure, include labeled diagrams to illustrate organelle functions.
Common mistakes
- Confusing organelle functions: Remember that the endoplasmic reticulum is primarily involved in the synthesis of proteins and lipids, while the Golgi apparatus modifies and packages these products.
- Confusing organelle functions: Remember that the RER is primarily involved in protein synthesis, while the Golgi apparatus modifies and packages these proteins.
Practice preview
- Which of the following organelles is responsible for ATP production in eukaryotic cells?
- Describe the structure and function of the nucleus in eukaryotic cells.
- A scientist observes a eukaryotic cell under a microscope and notes the presence of numerous ribosomes. What can be inferred about the cell's function?
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