1.1 Cells
Microscopy, biological drawings, magnification, cell structures, specialisation, stem cells, bacteria and diffusion.
How to study for CCEA GCSE Biology
Learn each process as a structure-and-mechanism chain, use data with units, and prepare every prescribed practical from planning through conclusion and evaluation.
Core concepts
Concept 1
Cell structures must be linked to their functions and to how specialised cells are adapted for a particular role.
Exam cue: Identify whether the task asks for a structure, its function, or the adaptation that connects the two.
Concept 2
Magnification, specimen size and image size form one quantitative relationship, with careful conversion between metres, millimetres and micrometres.
Exam cue: Convert both measurements to the same unit before using the magnification relationship.
Concept 3
Diffusion is the net movement of particles down a concentration gradient, so surface area, distance and gradient affect exchange rate.
Exam cue: For an exchange explanation, state the direction of the gradient and the feature that changes the rate.
Risk pitfalls and guardrails
Confusing magnification with resolution or treating a larger image as automatically more detailed.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Giving plant-only structures to an animal cell or a nucleus to a bacterial cell.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Describing diffusion as particles choosing to move or requiring cellular energy.
Guardrail: Do not import an England board, Single Award or Double Award structure, and do not replace a biological mechanism with a vague purpose statement.
Memory anchors
Magnification
Image size divided by the real size of the object, using matching units.
Resolution
The ability to distinguish two close points as separate.
Cell membrane
A selectively permeable boundary controlling movement into and out of a cell.
Mitochondrion
The site of aerobic respiration and energy release in a cell.
Specialised cell
A cell whose structure is adapted to perform a particular function.
Diffusion
Net particle movement from higher to lower concentration down a gradient.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
An image of a cell is 42 mm long. The real cell is 70 µm long. What is the magnification?
Why can an electron microscope reveal cell structures that a light microscope cannot distinguish?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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